题目内容
(1)﹣1
+(﹣
+
﹣
)×36;
(2)﹣99
×34;
(3)2x+(5x﹣3y)﹣2(3x+y);
(4)a2﹣2[a2﹣(2a2﹣b)].
解:(1)﹣14+(﹣
+
﹣
)×36=﹣1﹣
×36+
×36﹣
×36=﹣1﹣18+12﹣9=﹣16;
(2)﹣99
×34=(﹣100+
)×34=﹣3400+4=﹣3496;
(3)2x+(5x﹣3y)﹣2(3x+y)=2x+5x﹣3y﹣6x﹣2y=x﹣5y;
(4)a2﹣2[a2﹣(2a2﹣b)]=a2﹣2a2+2(2a2﹣b)=a2﹣2a2+4a2﹣2b=3a2﹣2b.
(2)﹣99
(3)2x+(5x﹣3y)﹣2(3x+y)=2x+5x﹣3y﹣6x﹣2y=x﹣5y;
(4)a2﹣2[a2﹣(2a2﹣b)]=a2﹣2a2+2(2a2﹣b)=a2﹣2a2+4a2﹣2b=3a2﹣2b.
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