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1/2 2/3×括号3/4%1/6括号除以7/9脱式计算

7/9÷2/3+2/9 =7/9×3/2+2/9 =7/6+2/9 =21/18+4/18 =25/18

6/7-6/7×(2/3+1/9) =6/7-6/7×7/9 =6/7×(1-7/9) =6/7×2/9 =4/21

(九又2/7-7又2/9)÷(5/9+5/9) =2又63分之4÷10/9 =130/63×9/10 =13/7 =1又7分之6

(-1-1/4×8/9)÷7/9 =(-1×9/7)-(1/4×9/7)×(8/9×9/7) =-9/7-9/28×8/7 =-36/28-9/28×8/7 =-36/28-36/98 =-63/49-18/49 =-81/49

[(7/9+1/3)÷(1/3+1/5)]×3/10 =[10/9÷8/15]×3/10 =10/9×3/10÷8/15 =1/3÷8/15 =5/8

直接用通分法即可: 原式=(3/8+1/4)+3/7-2/9 =(3+2)/8+3/7-2/9 =5/8+3/7-2/9 根据7,8,9最小公倍数是7×8×9=504 =(5×63+3×72-2×56)/504=419/504

1/6+1/5+1/2 =5/30+6/30+15/30 =11/30+15/30 =13/15

脱式计算 (3/4+1/6)*2/3 =3/4*2/3+1/6*2/3 =1/2+1/9 =11/18 25*1/5-5*1/5 =5-1 =4 6/11*7/15*10 =84/33 =28/11 (1/7+1/4)*28 =1/7*28+1/4*28 =4+7 =11 (21+2/5)*5/7 =21*5/7+2/5*5/7 =15+2/7 =15又2/7 39*7/13*2/3 =14

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