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7.28 3.2x2.5脱式计算

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

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3.2x2.5 +7.28=2.5*4*0.8+7.28=8+7.28=15.28

728+32x25=7.28+0.4x8x2.5=7.28+8=15.28

7.28+3.2÷2.5 =7.28+1.28 =8.56

2.5x3.2用脱式计算2.5x3.2=2.5*4*0.8=10*0.8=8直接计算答

2.4 x 2.5 + 1.6 x 2.5= 2.5 x (2.4 + 1.6)= 2.5 x 4.0= 10.02.4 x 2.5 - 1.6 x 2.5= 2.5 x (2.4 - 1.6)= 2.5 x 0.8= 2.0

7.2-6.45=7.2-6-0.4-0.05=1.2-0.4-0.45=0.8-0.05=0.75

2.5*7.2=2.5*4*1.8=10*1.8=18

2.5*3.2*12.5=2.5*4*0.8*12.5=10*10=100

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