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101x78简算方法

(100x78)十(1x78)

101*78-78=101*78-1*78=(101-1)*78=100*78=7800

1

101x0.78一0.91x78=101x0.78一91x0.78=(101-91)x0.78=10x0.78=7.8

你可以分两部分计算第一部分101*78=(100+1)*78=100*78+78=7800+78=7878第二部分=(100-1)*0.78=100*0.78-0.78=78-0.78=77.227878-77.22=7800.22基本就是这样,你把它加括号连起来就行=(100+1)*78-(100-1)*0.78

101x0.78-0.91x78=1.01x78-0.91x78=(1.01-0.91)x78=0.1x78=7.8

624*78=(625-1)*(80-2)=625*80-80-1250+2=50000-1330+2=48672

87x(100+1)=8700+87=8787

101x78 .5 一1.25x78.5x0.4=78 .5(101-1.25x0.4)=78 .5(101-0.5)=78.5(100+0.5)=7850+39.25=7889.25

101x87= (100 + 1)x87= 100x87 + 87= 8700 + 87= 8787

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