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9.7x0.67简算

9.7乘0.67=(10-0.3)x0.67=10x0.67-0.3x0.67=6.7-0.201=6.499

原式=9.9x6.7+1x0.67=9.9x6.7+0.1x6.7=(9.9+0.1)x6.7=10x6.7=67

9.7x4.03=(10-0.3)(4+0.03)=40-1.2+0.3-0.009=40+0.3-1.2-0.009=40.3-1.2-0.009=39.1-0.009=39.091

简便计算9.7X98-9.7十9.7x3=9.7*(98-1+3)=9.7*100=970

=0.67x100=670

9.7x0.43+2.57x9.7-9.7=9.7x(0.43+2.57-1)=9.7x2=19.4

9.7X1.25X0.8=9.7X(1.25x0.8)=9.7x1=9.7

9.7x16.4-9.7x6.4=9.7*(16.4-6.4)=9.7*10=97

9.7x9.9 +9.7=9.7(10-0.1)+9.7=97-0.97+9.7=96.03+9.7=105.73

9.7*689=6890-206.7=6683.3

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