题目内容
①(
+
﹣
)×(﹣24)
②﹣22+3×(﹣1)4﹣(﹣4)×5
③3a2+5﹣2a2﹣2a+3a﹣8
④3(﹣ab+2a)﹣2(3a﹣b)
②﹣22+3×(﹣1)4﹣(﹣4)×5
③3a2+5﹣2a2﹣2a+3a﹣8
④3(﹣ab+2a)﹣2(3a﹣b)
解:①(
+
﹣
)×(﹣24),
=
(﹣24)+
(﹣24)﹣
(﹣24),
=﹣9﹣4+18,
=5;
②﹣22+3×(﹣1)4﹣(﹣4)×5,
=﹣4+3+20,
=19;
③3a2+5﹣2a2﹣2a+3a﹣8,
=a2+a﹣3;
④3(﹣ab+2a)﹣2(3a﹣b),
=﹣3ab+6ab﹣6a+2b,
=3ab﹣6a+2b.
=
=﹣9﹣4+18,
=5;
②﹣22+3×(﹣1)4﹣(﹣4)×5,
=﹣4+3+20,
=19;
③3a2+5﹣2a2﹣2a+3a﹣8,
=a2+a﹣3;
④3(﹣ab+2a)﹣2(3a﹣b),
=﹣3ab+6ab﹣6a+2b,
=3ab﹣6a+2b.
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