计算:(1)-10-(-16)+(-24)(2)-20+(-14)-(-18)-13(3)-42×58-(-5)×0.25×(-4)3 &nb
计算:(1)-10-(-16)+(-24)(2)-20+(-14)-(-18)-13(3)-42×58-(-5)×0.25×(-4)3(4)(-12557)÷(-5)-2...
计算:(1)-10-(-16)+(-24)(2)-20+(-14)-(-18)-13(3)-42×58-(-5)×0.25×(-4)3 (4)(-12557)÷(-5)-2.5÷58×(-14)(5)-12-16×[(-22)+(-3)2](6)4x2+3xy-x2-9,其中x=2,y=-3(7)若a?ba+b=4,求代数式5(a?b)a+b-a+b2(a?b)的值.
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(1)-10-(-16)+(-24)=-10+16-24=-34+16=-18;
(2)-20+(-14)-(-18)-13=-20-14+18-13=11;
(3)-42×
-(-5)×0.25×(-4)3=-10-80=-90;
(4)(-125
)÷(-5)-2.5÷
×(-
)=25
-4=21
;
(5)-12-
×[(-22)+(-3)2]=-1-
×5=-1
;
(6)4x2+3xy-x2-9=3x2+2xy-9,
当x=2,y=-3时,原式=12-12-9=-9;
(7)当
=4时,
-
=20-
=19
.
(2)-20+(-14)-(-18)-13=-20-14+18-13=11;
(3)-42×
5 |
8 |
(4)(-125
5 |
7 |
5 |
8 |
1 |
4 |
1 |
7 |
1 |
7 |
(5)-12-
1 |
6 |
1 |
6 |
5 |
6 |
(6)4x2+3xy-x2-9=3x2+2xy-9,
当x=2,y=-3时,原式=12-12-9=-9;
(7)当
a?b |
a+b |
5(a?b) |
a+b |
a+b |
2(a?b) |
1 |
8 |
7 |
8 |
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