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1.25*(0.8×0.08+8)简便计算

=1.25*0.8*0.08+1.25*8 =1*0.08+10 =10.08

解: 7.85÷1.25÷0.08*0.2 =7又17/20÷5/4÷ 2/25*1/5 =(8-3/20)*4/5 * 25/2 *1/5 =8*4/5 * 25/2 *1/5-3/20*4/5 * 25/2 *1/5 =16-3/10 =16-0.3 =15.7

=(8+0.08)×1.25×0.3 =8×1.25×0.3+0.08×1.25×0.3 =3+0.03 =3.03

1.25x1.25x⋯1.25x0.8x⋯0.8。2008个1.25。2007个0.8 =(1.25x0.8)x……x(1.25x0.8)x1.25。2007个1.25x0.8 =1x……x1x1.25 =1.25

(1)8.08×1.25=(8+0.08)×1.25=8×1.25+0.08×1.25=10+0.1=10.1(2)49.5×101-49.5=49.5×(101-1)=49.5×100=4950(3)4.6+5.6×0.83=4.6+4.648=9.248(4)12.8+2.04×9.5=12.8+19.38=32.18(5)22-1.6×7 =22-11.2=10.8(6)2.5×0.6-1.8×0.5=1.5-0...

=(0.4x2.5)x(1.25x0.08) =1x0.1 =0.1

原式=8×1.25 + 0.8×1.25 - 0.08×1.25 =10 + 1 - 0.1 =10.9

(8一0.8一0.08)X1.25 =8×1.25-0.8×1.25-0.08×1.25 =10-1-0.1 =9-0.1 =8.9

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