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72x26十36x28简便方法

原式=72*26+(26+10)*28 =72*26+26*28+10*28 =(72+28)*26+280 =100*26+280 =2600+280 =2880

=36*2*26+36*48=36*(2*26+48)=36*(52+48)=36*100=3600

72x26十26x28用简便=(72+28)x26=100x26=2600

72x26+26x28=(72+28)x26=100x26=2600

72x26十36x52=(36x2)x26十36x52=36x(2x26)十36x52=36x52十36x52=36x(52十52)=36x104=36x(100+4)=36x100+36x4=3600+144=3744

72x26十30x48简便方法=8x(9x26+30x6)=8x(234+180)=8x414=8x400+8x10+8x4=3200+80+32=3312

你好:72x26+36x48=36*2*26+36*48=36*(52+48)=36*100=3600

72*26+30*48=24*3*2*13+3*10*24*2=24*3*2*(13+10)=144*(10+10+3)=1440+1440+432=2880+432=3312

72*26+14*52=72*26+14*(2*26)=72*26+(14*2)*26=72*26+28*26=(72+28)*26=100*26=2600

等于(72+28)*36等于100*36等于3600

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