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7.9+0.46%0.9+0.54简便计算

(7.9-0.9)+(0.46+0.54)=7+1=8

解;①7.9+0.46-0.9+0.54,=(7.9-0.9)+(0.46+0.54),=7+1,=8;②30÷2.5+1.6*2.5,=12+4,=16;③1.25*19.4*0.8,=(1.25*0.8)*19.4,=1*19.4,=19.4;④4.3*10.2,=4.3*(10+0.2),=4.3*10+4.3*0.2,=43+0.86,=43.86.

原式=7.9*(0.46+0.54)=7.9*1=7.9

0.46乘1.9加0.54乘0.8简便方法=0.46*(1+0.9)+0.54*(0.9-0.1)=0.46*1+0.46*0.9+0.54*0.9-0.54*0.1=(0.46+0.54)*0.9+0.46-0.054=1*0.9+(0.46-0.054)=0.9+0.0406=1.306

(1)2.9+0.46+7.1+0.54=(2.9+7.1)+(0.46+0.54)=10+1=11(2)27.6-11.31-5.69=27.6-(11.31+5.69)=27.6-17=10.6(3)3.6*99=3.6*(100-1)=3.6*100-3.6=360-3.6=356.4(4)32*2.5*12.5=8*4*2.5*12.5=(8*12.5)*(4*2.5)=100*10=1000(5)7.28÷0.4÷25=7.28÷(0.4*25)=7.28÷10=0.728(6)4.97*[2.46÷(5.58-5.28)]=4.97*[2.46÷0.3]=4.97*8.2=40.754

0.46*1.9+0.54*1.9=(0.46+0.54)*1.9=1*1.9=1.9

0.54*7+0.6*3.7=0.6*0.9*7+0.6*3.7=0.6*6.3+0.6*3.7=0.6*(6.3+3.7)=0.6*10=6

0.46x7.9+0.54x7.9=(0.46+0.54)x7.9=7.9

3.9乘以0.54=(4-0.1)*0.54=4*0.54-0.1*0.54=2.16-0.054=2.106 希望对您有所帮助 如有问题,可以追问.谢谢您的采纳

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