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6.8 0.35 0.5 4 简便计算

6.8x(0.35+0.5x4)=6.8x(0.35+2)=(7-0.2)(2+0.35)=7x2+7x0.35-0.2x2-0.2x0.35=14+2.45-0.04-0.07=16.34

解:2.4*6.8*0.5 =(2.4*0.5)*6.8 =1.2*6.8 =(1+0.2)*6.8 =6.8+1.36 =8.16

6.8÷(0.5+0.3x4)=6.8÷(0.5+1.2)=6.8÷1.7=4

原式=6.8÷0.5=6.8÷1/2=6.8x2=13.6 供参考.

(1)*0.56+0.44*6.8=6.8*(0.56+0.44)=6.8*1=6.8 (2)3.9*99+3.9=3.9*(99+1)=3.9*100=390 (3)0.25*3.75*40=0.25*40*3.75=10*3.75=37.5 (4)4.9+3.27+6.1+6.73=(4.9+6.1)+(3.27+6.73)=11+10=21

原式=6.8(4+6)=6.810=68

6.8÷0.5=6.8*2=13.6

6.8*0.5的简便运算6.8*0.5=3.4x2x0.5=3.4x1=3.4

(4÷0.35)÷0.5简便运算=4÷0.5÷0.35=8÷0.35=800/35=160/7=22又6/7

6.8/(1.2+0.5)*0.04 =6.8/1.7*0.04 =4*0.04 =0.16

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