题目内容
(1)计算:-14-2
+4
÷(-3)÷(-
)
(2)化简:(3a2-ab+7)-2(ab-2a2+1)
1 |
3 |
1 |
5 |
3 |
5 |
(2)化简:(3a2-ab+7)-2(ab-2a2+1)
(1)-14-2
+4
÷(-3)÷(-
)
=-1-2
+
×(-
)×(-
)
=-1-2
+
=-1;
(2)(3a2-ab+7)-2(ab-2a2+1)
=3a2-ab+7-2ab+4a2-2
=7a2-3ab+5.
1 |
3 |
1 |
5 |
3 |
5 |
=-1-2
1 |
3 |
21 |
5 |
1 |
3 |
5 |
3 |
=-1-2
1 |
3 |
7 |
3 |
=-1;
(2)(3a2-ab+7)-2(ab-2a2+1)
=3a2-ab+7-2ab+4a2-2
=7a2-3ab+5.
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