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脱式计算能简便的要简便2.6×5点3+4.7×2.6.

2.6*(5.3+4.7)=26

4、7x6/5+5、3÷(5/6) =4、7x6/5+5、3x6/5 =(4、7+5、3)x6/5 =10x6/5 =12

2.6×5.3+4.7×2.6 =2.6×(5.3+4.7) =2.6×10 =26

(1)2.98+0.8+0.2=2.98+(0.8+0.2)=2.98+1=3.98;(2)2.39+4.7+3.61+2.3=(2.39+3.61)+(2.3+4.7)=6+7=13;(3)9.45-(2.28+3.45)=9.45-2.28-3.45=9.45-3.45-2.28=6-2.28=3.72.

3.25×4.7-7.8 =15.275-7.8 =7.475 没有简便方法

8.5×4.7+5.3×8.5 =8.5x(4.7+5.3) =8.5x10 =85

(1)33.5-5.3-4.7+16.5,=(33.5+16.5)-(5.3+4.7),=50-10,=40;(2)9900÷25÷4,=9900÷(25×4),=9900÷100,=99;(3)1÷( 3 5 + 3 10 ),=1÷ 9 10 ,= 10 9 ;(4)24×( 2 3 + 1 6 - 3 8 ),=24× 2 3 +24× 1 6 -24× 3 8 ,=16+4-9...

4.7+4.8+4.9+5.0+5.1+5.2+5.3 =(4.7+5.3)+(4.8+5.2)+(4.9+5.1)+5.0 =10+10+10+5 =35

=-0.9-1.3+2.1-4.7 =1.2-1.3-4.7 =1.2-6 =-4.8 希望我的回答能够解决你的问题, 如果有疑问继续追问。

5.3×4.27+ 4.7×4.27 =4.27×(5.3+4.7) =4.27×10 =42.7

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