There are no constant terms and cubic terms.
So n=-3 and m=5.
2.[(m+n)(m-n)-(m-n) squared +2n(m-n)] divided by 4n.
=(m^2-n^2-m^2+2mn-n^2+2mn-2n^2)/4n
=(-4n^2+4mn)/4n
=-n+m=8
Math problems in the sixth grade of primary school, online, etc. It is urgent (2) to make both 0.25% and 25% of the ingredients 1/4.
1/4*( 1.8+ 1.2+ 1)= 1
1.2/3÷[(2/3+ 1/5)÷ 1/2]
=2/3÷(4/3+2/5)
=2/3×3/4+2/3×5/2
= 1/2+5/3
= 13/6
2. 1.8× 1/4+ 1.2×0.25+25%
=( 1.8+ 1.2+ 1)× 1/4
=4× 1/4
= 1
3.[ 1-(3/ 10+ 1/5)]÷4/5
=( 1- 1/ 10)÷4/5
=9/ 10×5/4
=9/8
1.2/3÷[(2/3+ 1/5)÷ 1/2]
=2/3÷[ 13/ 15×2]
=2/3÷26/ 15
=2/3× 15/26
=5/ 13
2. 1.8× 1/4+ 1.2×0.25+25%
= 1.8×0.25+ 1.2×0.25+0.25
=0.25×( 1.8+ 1.2+ 1)
=0.25×4
= 1
3.[ 1-(3/ 10+ 1/5)]÷4/5
=[ 1- 1/2]×5/4
= 1/2×5/4
=5/8
1.2/3÷[(2/3+ 1/5)÷ 1/2]
=2/3÷[ 2/3×2+ 1/5×5 ]
=2/3÷7/3
=2/7
2. 1.8× 1/4+ 1.2×0.25+25%
= 1.8×0.25+ 1.2×0.25+ 1×0.25
=( 1.8+ 1.2+ 1)×0.25
=4×0.25
= 1
3.[ 1-(3/ 10+ 1/5)]÷4/5
=[ 1- 1/2]÷4/5
= 1/2÷4/5
=5/8
Hope to adopt!
A math problem in the sixth grade of primary school, online, etc. , urgent! Step 1: The working efficiency of Team A is 1/8, and that of Team B is112.
Step 2: How many 3/8s did Team A complete in three days after Team B was transferred?
Step 3: The remaining workload is 1-3/8=5/8.
Step 4: Party A and Party B can complete the remaining workload in a few days. The formula is 5/8/(1/8+112) = 3 days.
A: Team B dug for three days.
Elementary school sixth grade math problem! Urgent! On-line ~ reward 100 integral ~ solution: let the rectangular bottom area be a and the cylindrical container bottom area be b.
18min water injection: B×(50-20). Water velocity: B×(30-20)÷ 18=B×.
Therefore, the volume of water flowing in within 3 minutes is: water flow velocity ×3=B×5.
On the other hand, the water injection amount of 3 minutes is the volume around the iron block: b× 20-a× 20.
Therefore, b× 20-a× 20 = b× 5.
A: B = 15:20=3:4.
Elementary school sixth grade mathematics simple questions, urgent, online and so on! This should be a plus sign.
What is impossible to calculate in primary school mathematics overflows with computer calculation, but the quantity is too large.
If it's a plus sign
Plus the first one, the last one is 10000.
Then gradually, 4999+500 1, which is 4999 10000 lower. Then add 5000, and that's the answer.
The answer is 49995000.
Hope to adopt
Math problems in the sixth grade of primary school, online, etc. , urgent! Absolute high score! 1 (Then there are130,000 tons of garbage! ) 13 billion times 100 can be simplified.
(Then everyone 0.2 yuan! ) 260 million divided by 654.38+03 billion
Because the inner ring line is 6000m longer than the middle ring line, 6000m = 6km.
So the midline =28 divided by a quarter MINUS 6.
= 1 12-6
= 106 km
Because team A completed it in 18 days, the work efficiency of team B is half that of team A,
Therefore, the work efficiency of team B is one ninth of the formula.
Two thirds divided by (one ninth +65438+ one eighth) =4 days.
The formula for the volume of a cylinder is: multiply the square of the pie R by the high pie, and take 3. 14.
3. 14 times the square of 2.5 times 20 =392.5
Because 1 m3 pier needs165kg cement.
So 392.5 times 165 =64762.5 kg.
5 20 divided by 1.5 = 13 tons.
、
Solution: Set: This batch has X air conditioners.
20%X+20+8=40%X
Solution: X= 140
Because blood flows three times as fast in the aorta as in the vein, in the aorta, the blood flow is about half a meter per second.
So half times three equals one-sixth.
6 (12- 10) divided by 10=20%.
9。 Really? It's that simple? That's 60%
For the formula of 10, multiply the square of r by the height and divide it by 2 to get 3. 14.
3. 14 times 4 times 4 times 6 divided by 2= 150.72.
2 July 1? Wrong title, China is the Army Day in August of 1 year!
China * * * was founded in (19 12). There are (29) days in late February this year.
4 wrong
5 Wrong because of a pen 10 yuan, if the price is reduced by 20% first, it will be 8 yuan, and if the price is increased by 20%, it will be 20% of 8, and it will be 9.6 yuan.
3 Zheng
Dizzy! Ask fewer questions in the future!
A math problem in the sixth grade of primary school! The total number of urgent books is X.
2 5X = 72
X=360
Urgent! The math problem in the sixth grade of primary school is 1, and the aluminum skin =2.5×6×3. 14.
2. Volume =2.5×6×6
Two cars per hour.
480 ÷ 4 = 120 (km)
Car A runs every hour.
120× (5+3) 5 = 75km
B train runs every hour.
120× (5+3) 3 = 45km
Elementary school sixth grade math problem, urgent! thank you There are three situations:
(1) If the straight line passes through two vertices adjacent to the vertex of the angle at the same time, there are four corners left, which is 80% of the original number;
(2) If the straight line only passes through one of the two vertices adjacent to the vertex of the angle, there are five angles left, which is100% of the original number of angles;
(3) If the straight line does not pass through two vertices adjacent to the vertex of an angle, there are six angles left, which is 120% of the original angle.