题目内容
用适当的方法进行简便计算:
(1)(﹣32
)﹣[5
﹣(+3
)+(﹣5
)+(﹣2
)]
(2)25×
﹣(﹣25)×
+25×(﹣
)
(1)(﹣32
(2)25×
解:(1)原式=(﹣32
)﹣(5
﹣3
﹣5
﹣2
)
=﹣32
﹣5
+3
+5
+2
=﹣32
+(5
﹣5
)+(3
+2
)
=﹣26
;
(2)原式=25×
+25×
+25×(﹣
)
=25×[
+
+(﹣
)]
=25.
=﹣32
=﹣32
=﹣26
(2)原式=25×
=25×[
=25.
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