问题 解答题
简便计算.
28×199
15×4×250×688×22+22×12.
答案

(1)28×199

=28×(200-1)

=28×200-28

=5600-28

=5572

(2)15×4×250×6

=(15×6)×(4×250)

=90×1000

=90000

(3)88×22+22×12

=(88+12)×22

=100×22

=2200

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