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4.8 3.1的简便计算

6.9+ 4.8 +3.1=(6.9+3.1)+4.8=14.8

32 +4.90.9+6.9 +4.8 +3.1=34.9-0.9+(6.9+3.1)+4.8=34+10+4.8=48.8

6.9+4.8+3.1=(6.9+3.1)+4.8=10+4.8=14.8

9.1=1.3x7.4.8=1.6x3.0.5=0.25x2 原算是式=7x1.3/1.3x3x1.6/1.6x2x0.25/0.25 =7x3x2=42

是这样的:48x0.69+3.1x4.8 =(0.69+3.1)x48x4.8 =1x48x4.8 =48x4.8 =230.4

4.8加上2.7乘以3.1=4.8+0.37=13.17 没有合适的简便方法 直接计算

48X0.69+3.1X4.8 =48X0.69+0.31X48 =48X(0.69+0.31) =48X1 =48

3/4-5/8+1/4-1/8=(3/4+1/4)-(5/8+1/8)=1-3/4=1/4

简便计算4.8*(15÷2.4)=4.8÷2.4*15=2*15=30

48*0.69 +3.1*4.8= 48*0.69+0. 31*48=48*(0.69+0.31)=48*1=48

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