题目内容
计算与化简:
①(-2)3-
÷(-
)×(-2)2
②
×16-25÷
+|-2|×
③化简:(2x2+3x-
)-4(x2-x+
)
①(-2)3-
| 1 |
| 4 |
| 1 |
| 16 |
②
| 8 |
| 7 |
| 7 |
| 8 |
| 8 |
| 7 |
③化简:(2x2+3x-
| 1 |
| 2 |
| 1 |
| 2 |
①原式=-8-
×(-16)×4=-8+16=8;
②原式=
×16-25×
+2×
=
×(16-25+2)=
×(-7)=-8;
③原式=2x2+3x-
-4x2+4x-2=-2x2+7x-
.
| 1 |
| 4 |
②原式=
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
③原式=2x2+3x-
| 1 |
| 2 |
| 5 |
| 2 |
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