问题 解答题
脱式计算
(1)(12+20)×45
(2)28×17-58(3)28+12×39(4)1500-125×8.
答案

(1)(12+20)×45,

=32×45,

=1440;

(2)28×17-58,

=476-58,

=418;

(3)28+12×39,

=28+468,

=496;

(4)1500-125×8,

=1500-1000,

=500.

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