56*7+45*7-7 59*101 99*63 192*17-92*17 57*9+57简便运算
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2017-03-14 · 知道合伙人教育行家
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56*7+45*7-7
=(56+45-1)*7
=100*7
=700
59*101
=59*(100+1)
=59*100+59*1
=5900+59
=5959
99*63
=(100-1)*63
=100*63-1*63
=6300-63
=6237
192*17-92*17
=(192-92)*17
=100*17
=1700
57*9+57
=57*(9+1)
=57*10
=570
=(56+45-1)*7
=100*7
=700
59*101
=59*(100+1)
=59*100+59*1
=5900+59
=5959
99*63
=(100-1)*63
=100*63-1*63
=6300-63
=6237
192*17-92*17
=(192-92)*17
=100*17
=1700
57*9+57
=57*(9+1)
=57*10
=570
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