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7/9乘多少等于多少乘1/6等于7/13减多少等于多少乘0...

计算 7/9×9/7 =1 =6×1/6 =7/13×13/7 =10/9×0.9

1÷7/9=9/7, 1÷1/6=6, 7/13-1=-6/13, 1÷0.9=10/9, 所以7/9×(9/7)=(6)×1/6=7/13-(-6/13)=(10/9)×0.9=1

如图

5/7减5/9乘5/7,等于20/63。1/6乘五减2/3括号等于13/18

7/9加5/6减1/4的和乘与72 =[(7/9)+(5/6)-(1/4) ]72 =[(28+30-9)/36]72 =2(28+30-9) =2(49) =98

【7/4】乘以4/7 等于八乘以【1/8】 等于3/5除以【3/5】 等于【6÷】六 等于4/9加【5/9】 等于一

供参考

2

98*3/97 =(97+1)*3/97 =97*3/97+3/97 =3+3/97 =3*(1+1/97) =3*98/97 =3(100-2)/97 =(300-6)/97 =294/97. 42*(5/6+3/7+1/14) =42*5/6+42*3/7+42*1/14 =7*5+6*3+3*1 =35+18+3 =35+21 =56

1又4/9-7/13+3又7/9-6/13 =(1又4/9+3又7/9)-(7/13+6/13) =5又2/9-1 =4又2/9

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