Original formula = [a 2-(a-2) (a+2)]/(a-2)
=[a^2-a^2+4]/(a-2)
=4/(a-2)。
Mathematical fraction operation 2s ÷ (s/v1+s/v2) = 2 ÷ (1/v1+v2) = v1v2/(v1+v2).
Mathematical Fraction Operation Problem 1.2/2x- 1=4/4x? - 1
1/2x- 1 = 2/(2x- 1)(2x+ 1)
1=2/(2x+ 1)
2x+ 1=2
x= 1/2
2.3/x？ +2x - 1/x？ -2x=0
3/x(x+2)- 1/x(x-2)=0
3(x-2)/x(x？ -4)-(x+2)/x(x？ -4)=0
(3x-6-x-2)/x(x？ -4)=0
2x-8=0
x=4
3.x/x-3=x+ 1/x- 1
x(x- 1)=(x+ 1)(x-3)
x？ -x=x？ -2x-3
x=-3
4.x-3/x-2 + 1=3/2-x
x-3/x-2 + 1=-3/x-2
x-3+x-2=-3
2x=2
x= 1
5.2x+ 1/x？ +x = 5/6x+6
2x+ 1/x(x+ 1)= 5/6(x+ 1)
6(2x+ 1)=5x
12x+6-5x=0
7x=-6
x=-6/7
6.3/2- 1/3x- 1 = 5/6x-2
[3(3x- 1)-2]/2(3x- 1)= 5/2(3x- 1)
9x-3-2=5
9x= 10
x= 10/9
Solution: 1, the original formula =(s-2t)2s/(s+2t)=(2s? -4st)/(s+2t)
2. The original formula =(x-y)/(x+y)× 1/(x-y)? = 1/(x？ -Really? )
3. The original formula =(u-2u)/(u+2u)-2/(u+2u)(u-2u)
=(u-2u)？ /(u+2u)(u-2u) - 2/(u+2u)(u-2u)
=-(u？ -2)/3u？
I hope I can help you!
No one else can answer the question of mixed operation of math scores in the second day of junior high school
Find 10 Math Fraction Mixed Operation Problem 2a+1-a+3a2-4a-5 ÷ a2-9a2-3a-10.
Solution formula = [x+2 x (x-2)-x- 1 (x-2) 2]? X 4-x (polynomial factorization factor of fractional denominator in parentheses. Law of division of fractions)
=[(x+2)(x-2)x(x-2)2-x(x- 1)x(x-2)2]？ X4-x (law of fractional subtraction with different denominators)
=x2-4-x2+x x(x-2)2？ X4-x (algebraic expression operation)
=x-4x(x-2)2？ X4-x (merging similar projects)
=x-4 x(x-2)2？ (-xx-4) (Symbolic Law of Fractions)
=- 1 (x-2) 2。 (law of multiplication of fractions)
Calculate x+yx2-xy+(x2-y2x) 2? ( 1 y-x)3。
Solve the formula = x+y x (x-y)+(x+y) 2 (x-y) 2x2? 1(y-x)3
=x+y x(x-y)-(x+y)2 x2(x-y)
=x2+xy-x2-2xy-y2 x2(x-y)
=-xy-y2 x2(x-y)=-xy+y2 x2(x-y)。
x-y+4xy x-y)(x+y-4xyx+y)
Answers x2-y2
[ 1(a+b)2- 1(a-b)2]÷ 1a+b- 1a-b
Answer 2a (a+b) (a-b);
x x-y？ y2 x+y-x4y x4-y4÷x2 x2+y2
Answer -xy x+y
3x-2 x2-x-2+( 1- 1x+ 1)÷( 1+ 1x- 1)
Answer x2 (x+1) (x-2);
(2x x+ 1+2x- 1+4x x2- 1)×(2x x+ 1+2x- 1-4x x2- 1)。
Answer 4
Original, no copy
The mixed operation of math scores in grade two of junior high school solves answer 9, simplification,
Primitive formula
=(2m？ -4m-m？ -2m)/(m？ -4) * (m？ -4)/m
=(m？ -6m)/(m？ -4)* (m？ -4)/m
=m-6
10, simplification,
(1) original formula
=(x- 1-x- 1)/(x？ - 1)* (x？ - 1)/2
=-2/(x？ - 1)*(x？ - 1)/2
=- 1
(2) the original formula
=(a？ -4+4)/(a？ -4)*(a-2)/a
=a？ /(a+2)(a-2)*(a-2)/a
=a/(a+2)
(3) the original formula
=(m+ 1)/m * (m- 1)？ /(m+ 1)(m- 1)
=(m- 1)/m
1 1, original type
=(x？ -2x+ 1+2x)/(x？ - 1) * (x？ - 1)
=x？ + 1
Whether x=-2 or x=2, x? +1 are all equal to 5.
Math Score Calculation of Grade Two [3x/(x-2)-x/(x+2)] × (x2-4)/x
=[3x(x+2)-x(x-2)/(x-2)(x+2)]×(x2-4)/x
=[3 x2+6x-x2-2x/(x-2)(x+2)]×(x2-4)/x
=[x(2x-4)/(x-2)(x+2)]×(x-2)(x+2)/x
=2x-4
good
The rule of multiplication and division for the expression operation of math algebra in Grade 2: (15 * 53 * 32-15 * 52+15 * 5)/15.
=5^3*3^2-5^2+5
= 1 105
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