5+2 1*8/2-6-59
68/2 1-8- 1 1*8+6 1
-2/9-7/9-56
4.6-(-3/4+ 1.6-4-3/4)
1/2+3+5/6-7/ 12
[2/3-4- 1/4*(-0.4)]/ 1/3+2
22+(-4)+(-2)+4*3
-2*8-8* 1/2+8/ 1/8
(2/3+ 1/2)/(- 1/ 12)*(- 12)
(-28)/(-6+4)+(- 1)
2/(-2)+0/7-(-8)*(-2)
( 1/4-5/6+ 1/3+2/3)/ 1/2
18-6/(-3)*(-2)
(5+3/8*8/30/(-2)-3
(-84)/2*(-3)/(-6)
1/2*(-4/ 15)/2/3
-3x+2y-5x-7y
(1) Write -2-(+3)-(-5)+(-4)+(+3) in the form of omitting brackets, and the correct one is ().
A.-2-3-5-4+3 B.-2+3+5-4+3
C.-2-3+5-4+3 D.-2-3-5+4+3
(2) The result of calculating (-5)-(+3)+(-9)-(-7)+ is correct ().
A.- 10 B.-9 C.8 D.-23
(3) The algebraic sum of-7,-12 and +2 is less than the sum of their absolute values ()
A.-38 B- 4 c . 4d . 38
(4) If +(b+3)2=0, the value of b-a- is ().
A.-4 B.-2 C.- 1 D. 1
(5) The following statement is true ()
A. the subtraction of two negative numbers is equal to the subtraction of absolute values.
B the difference between two negative numbers must be greater than zero.
C. A positive number minus a negative number is actually the algebraic sum of two positive numbers.
D. negative negative positive equals the absolute value of negative plus positive.
(6) Equation -3-5 cannot be read as ()
The difference between A.-3 and 5. The sum of b. 3 and -5.
Difference between c-3 and -5d-3 minus 5
2. Fill in the blanks: (4 ′× 4 =16 ′)
( 1)-4+7-9=- - + ;
(2)6- 1 1+4+2=- + - + ;
(3)(-5)+(+8)-(+2)-(-3)= + - + ;
(4)5-(-3 )-(+7)-2 =5+ - - + - .
3. Write the following form in the form of sum, without brackets, and say two pronunciation ways: (8 ′× 2 =16 ′)
( 1)(-2 1)+(+ 16)-(- 13)-(+7)+(-6);
(2)-2 -(- )+(-0.5)+(+2)-(+ )-2.
4. Calculation problem (6 ′× 4 = 24 ′)
( 1)- 1+2-3+4-5+6-7;
(2)-50-28+(-24)-(-22);
(3)- 19.8-(-20.3)-(+20.2)- 10.8;
(4)0.25- +(- 1 )-(+3 ).
5. When x =-3.7, y =- 1.8 and z =- 1.5, find the value of the following algebraic expression (5 ′× 4 = 20 ′).
( 1)x+y-z； (2)-x-y+z； (3)-x+y+z； (4)x-y-z。
A water conservancy survey team swam 5 kilometers on the first day, 5 kilometers on the second day, 4 kilometers on the third day and 4.5 kilometers on the fourth day. Where is the survey team at this time? How many kilometers apart?
6. The order of mixed operation of rational numbers is: calculate first, then calculate, and finally calculate. If there is, count it in first.
1 1、8-4÷(-2); 12、-9+5×(-6)- 12÷(-6)
14、- 1-〔 1-( 1-0.6÷3)〕×〔2-(-3)×(-4)〕;
20、0÷(-4)-42-(-8)÷(- 1)3;
2 1、-32-(-3) 2-(-3)3+(- 1)6;
24、3×(-2)2+(-2×3)2+(-2+3)2;
34、(- 12)÷4×(-6)÷2;
(
36、(- 12)÷4×(-6)÷2;
48. It is known that | a | = 3 and the reciprocal of b is -5. Find the value of a-b ..
49. When, find the value of (2k2-4k-1) ÷ (k2+k+1).
50. Known a>0, ab<0, simplified | a-b+4 |-b-a-3 |.
The mixed operation practice of rational numbers in junior one mathematics.
Synchronize to the outline exercise (45 minutes, full mark 100)
1. Calculation problem: (10 ′× 5 = 50 ′)
( 1)3.28-4.76+ 1 - ;
(2)2.75-2 -3 + 1 ;
(3)42÷(- 1 )- 1 ÷(-0. 125);
(4)(-48) ÷82-(-25) ÷(-6)2;
(5)- +( )×(-2.4).
2. Calculation problem: (10 ′× 5 = 50 ′)
( 1)-23÷ 1 ×(- 1 )2÷( 1 )2;
(2)- 14-(2-0.5)× ×[( )2-( )3];
(3)- 1 ×[ 1-3×(- )2]-( )2×(-2)3÷(- )3
(4)(0. 12+0.32) ÷ [-22+(-3)2-3 × ];
(5)-6.24×32+3 1.2×(-2)3+(-0.5 1) ×624.
Quality optimization training
1. Fill in the blanks:
(1) If yes, then AC 0；; ; If so, then AC 0；;
(2) If yes, then ABC =；; -a2b2c 2 =；
(3) Given that A and B are reciprocal, C and D are reciprocal, and the absolute value of X is equal to 2, then x2-(a+b)+cdx=.
2. Calculation:
( 1)-32-
(2){ 1+[ ]×(-2)4}÷(- );
(3)5-3×{-2+4×[-3×(-2)2-(-4) ÷(- 1)3]-7}.
Practical application of life
A bought a stock with 1 0,000 yuan, and then he resold the stock to B, earning 10%, and then B resold the stock to A, but B lost 10%. Finally, A sells the stock to B at 10% of the price that B sells to A.. In the above stock trading, ()
A.a just breaks even; B. profit 1 yuan;
C.A. Profit from 9 yuan; D. Loss of Party A 1. 1 yuan.
Reference answer:
Synchronous outline exercise
1.( 1)-0.73 (2)- 1 ; (3)- 14; (4)- ; (5)-2.9
2.( 1)-3 (2)- 1 ; (3)- ; (4) 1; (5)-624.
Quality optimization training
1.( 1)>，& gt； (2)24,-576; (3)2 or 6. [Hint: ∫= 2 ∴x2=4, x = 2]. ( 1)-3 1; (2)-8 (3)224
Practical application of life b