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6/7×4/9+4/7×1/9简便计算

解:根据提取公因式的简便方法, 原式=4/7x6/9+4/7x1/9 =4/7x(6/9+1/9) =4/7x7/9 =4/9

解:4/9×7/5+1/7×1/9=1/9*(28/5+1/7)=1/9*201/35=67/105

6/7×4/9+4/7×1/9 =(4×6)/(7×9)+(4×1)/(7×9) =(4×6+4×1)/(7×9) =(4×7)/(7×9) =4/9

分数表示的方法为9分之1表示为1/9,“/”为分数线,前面的数字为分子,后面的数字为分母 则原题式子为: 6/7×4/9+4/7×1/9 =4/7×6/9+4/7×1/9 =4/7×(6/9+1/9) =4/7×7/9 =4/9

1# 2/3(5/7+2/7) =2/3 2# 3/4*1/9+1/4*1/9 =(3/4+1/4)*1/9 =1/9 3# 5-(6/7*14/3+3/16) =5-4-3/16 =13/16

4/5+7/9+1/2 =(4×18+7×10+1×45)/90 =(72+70+45)/90 =187/90

7.6×1.9-96.2÷7.4的简便运算 7.6×1.9-96.2÷7.4 =14.44-13 =1.44

=(1-1/2)+(1-1/3)+...(1-1/10) =9-(1/2+1/3+...1/10) =9-[1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10] =9-[(1/2+1/3+1/6)+(1/4+1/5+1/10)+1/7+1/8+1/9] =9-(1+11/20+1/8+1/7+1/9) =9-(1+27/40+1/9+1/7) =9-(1+283/360+1/7) =8-2341/2520

3/7 4/15 15/26

(9/7+6/5-4/1)×72 =72×7/9+72×5/6-72×1/4 =56+60-18 =98

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