Question

计算：5/7-（3/14+4/21）

Answer 1

计算：5/7-（3/14+4/21）

5/7-（3/14+4/21）
=5/7-3/14-4/21
=10/14-3/14-4/21
=7/14-4/21
=1/2-4/21
=21/42-8/42
=13/42

简便计算。15/16×9/10÷5/12 5/14÷10/21×5/7 3/20×14×5/7

15/16×9/10÷5/12
=27/32×12/5
=27×3/（8×5）
=81/80
5/14÷10/21×5/7
=5/14×21/10×5/7
=15/28
3/20×14×5/7
=3/4×2
=3/2
=1又2分之1

3/2+3/4+4/5+5/14+4/21+3/28+2/35-3/7=简算

2/3+3/4+4/5+5/14+4/21+3/28+2/35-3/7
=2/3+4/21+3/4+3/28+4/5+2/35+5/14-3/7
=6/7+6/7+6/7-1/14
=18/7-1/14
=35/14

计算：3/7*5/13-（9/14-3/14）*（-11/13）-3/7*3/13

3/7*5/13-（9/14-3/14）*（-11/13）-3/7*3/13
=(5/13-3/13)*3/7-6/14*(-11/13)
=2/13*3/7+3/7*11/13
=(2/13+11/13)*3/7
=3/7

计算：(-1)*14/3/(-4)+(-5/4)*0.4/(-1/3)-2

计算：
(-1)*14/3/(-4)+(-5/4)*0.4/(-1/3)-2
=-14/3/(-4)-0.5/(-1/3)-2
=7/6+1/6-2
=4/3-2
=-2/3

3/15*3/21+18/13*5/21怎么计算

3/13*5/21+18/13*5/21
=(3/13+18/13)*5/21
=21/13*5/21
=5/13

计算：（4/7-1/3)×21 2、5/14×15-5/14 3、36×（2/3+1/6+3/4)

（4/7-1/3)×21=5 5/14×15-5/14=536×（2/3+1/6+3/4)=57

计算:(-5/7)×( -14/3)÷5/3

:(-5/7)×( -14/3)÷5/3
=-5x(-2/3)÷5/3
=10/3x3/5
=2

x 3/7x=5/14怎么计算

(1+3/7)X=5/14，
X=5/14÷10/7，
X=1/4。

计算3/10÷[15x(5/7一3/5)]

3/10÷[15x(5/7一3/5)]
=3/10÷【15×4/35]
=3/10÷12/7
=7/40