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4x0.8x2.5脱式计算题

(40十0.8)x2.5=40x2.5+0.8x2.5=100+2=102

7.28十3.2x2.5=7.28十0.8x4x2.5=7.28+0.8x10=7.28+8=15.28

0.4x0.8x1.255x2.5= (0.4x2.5)x(0.8x1.25+0.8*0.005)= 1 x(1+0.004)= 1 x 1.004= 1.004

解,原式=0.5x12.5x(8x0.4x2)x2.5 =(0.5x2)x(12.5x8)x(0.4x2.5) =1x100x1 =100

0.4x63x2.5=0.4x2.5x63=1x63=63

4.4x2.5=(4+0.4)x2.5=4x2.5+0.4x2.5=10+0.1=10.01

4x(6.3x2.5)=4x2.5x6.3=10x6.3=63

3.5x0.8x2.4=0.7x5x0.8x2.4=0.7x4x2.4=0.7x9.6=6.72

0.4*2.5*12

原式=61.7÷(4*2.5)=61.7÷10=6.17

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