问题标题:
数学巧算四道题,求帮解:1.125x88+404x25=?2.320x44+68x440=?3.79x79-79+22x79=?4.25x57+25x42+25=?
问题描述:
数学巧算四道题,求帮解:
1.125x88+404x25=?
2.320x44+68x440=?
3.79x79-79+22x79=?
4.25x57+25x42+25=?
罗忠亮回答:
1.125x88+404x25
=125x8x11+101x4x25
=11000+10100
=21100
2.320x44+68x440
=44x(320+680)
=44x1000
=44000
3.79x79-79+22x79
=79x(79-1+22)
=79x100=7900
4.25x57+25x42+25
=25x(57+42+1)
=25x100=2500
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