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5/2一5/12一1/6 除以2/8用简便方法计算

2×1/6÷(5/8) =1/3x8/5 =8/15 这题没有简便方法

如图

=21.6/0.8-1.2*5 =216/8-1.2*5 =27-6 =21 简便在分子与分母同时乘以10

1.原式=1.2×198-98×1.2=1.2×(198-98)=1.2×100=120 另 2题后面是否有中括号 ?

你好! 1/2÷4/5÷(2/9×3/8) =1/2÷(2/9×3/8)÷4/5 =1/2*1/(2/9×3/8)*5/4 =5/2*(2/9×3/8)*4 =5÷(2/3) =7.5 (5/6-3/4)÷5/12÷9/5 = (5/6-3/4)*12/5*5/9 =1/5*5/9 =1/9 3/7÷[5/7-(3/7+1/5)] =3/7÷[5/7-3/7-1/5] =3/7÷(2/7-1/5) =3/7*1/(2/7-1/...

2-5/6+1又7/8 =7/6+15/8 =28/24+45/24 =73/24 =3又1/24

按运算顺序计算: 25×5/8+1/6-2又1/3 =(24+1)×5/8+1/6-(2+1/3) =15+5/8+1/6-2-1/3 =13+5/8-1/6 =13+11/24 =13又11/24。

(2+4+6+8……+20)-(1+3+5+……+19) =(2-1)+(3-2)+...+(20-19) =1+1+...+1 =10

(7/8-7/8×4/5)÷7/6 =7/8×(1-4/5)×6/7 =3/4×1/5 =3/20 7/12÷1/6+5/6×2 =7/12+5/12 =1 11÷11/12-11/12÷11 =12-1/12 =11又12分之11

7/8-5/12+1/6=7/8-(5/12-1/6)=7/8+1/12=21/24+2/24=23/24 5/7*16.31-2.31/(7/5)=5/7(16.31-2.31)=5/7*14=10 35/(7/8)*(1-2/7)=35/(35/56)=56 3.2x-3*4=52 x= 40/3.2= 40*5/16=25/2 v=πr^2h=3.14*9*12=339=340 合格

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