15.37*7.88-9..37*7.88+15.37*2.12-9.37*2.12简便计算
人气:144 ℃ 时间:2020-01-29 05:20:53
解答
15.37*7.88-9..37*7.88+15.37*2.12-9.37*2.12
=7.88*(15.37-9.37)+2.12*(15.37-9.37)
=7.88*6+2.12*6
=6*(7.88+2.12)
=6*10
=60
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