题目内容
计算:
①(-81)÷2
×(-
)×24; ②-2(2x2-xy)+4(x2+xy-1)
①(-81)÷2
| 1 |
| 4 |
| 4 |
| 9 |
①原式=(-81)÷
×(-
)×16
=(-81)×
×( -
)×16
=16×16
=256,
②原式=-4x2+2xy+4x2+4xy-4
=6xy-4.
| 9 |
| 4 |
| 4 |
| 9 |
=(-81)×
| 4 |
| 9 |
| 4 |
| 9 |
=16×16
=256,
②原式=-4x2+2xy+4x2+4xy-4
=6xy-4.
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