问题 解答题

简便计算.

35×7×2

9×250×4

201×45

236+199.

答案

(1)35×7×2

=35×2×7

=70×7

=490

(2)9×250×4

=9×(250×4)

=9×1000

=9000

(3)201×45

=(200+1)×45

=200×45+1×45

=9000+45

=9045

(4)236+199

=236+200-1

=435

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