8十545x18簡便,58十545x18簡便

2021-03-04 09:22:07 字數 2133 閱讀 7423

1樓:豔陽在高照

=(1/8+1/45)*5*18

=(1/8+1/45)*90

=90/8+90/45

=45/4+2

=53/4

(5/8十8/45)x18用簡便方法計算等於多少

2樓:匿名使用者

(5/8+8/45)×18

=5/8×18+8/45×18

=45/4+16/5

=11.25+3.2

=14.45

3樓:匿名使用者

(5/8十8/45)x18

=(5/8)x18+(8/45)x18

=45/4+16/5

=11+1/4+3+1/5

=14+9/20

=14又20分之9

5/9×45-5/9x18簡便計算

4樓:匿名使用者

=5/9×(45-18)

=5/9×27=15

5樓:北方我的北方

=5/9×(45-18)

=5/9×27

=5×3=15

1/8×45+5/8×31用簡便方法計算.

6樓:凌月霜丶

1/8*45+5/8*31

=1/8*45+1/8*31*5

=1/8*(45+155)

=1/8*200

=12.5

(1/15+1/21)×105 45÷5/7÷7/8 8/13÷7-1/7×6/13 1/5×5/8-1/5÷8/3 3/5÷5/8+2/5÷5/8簡便運算

7樓:叫啥知不道

(1/15+1/21)×105

=(1/15)

*(15*7)+(1/21)*(21*5)=7+5

=1245÷5/7÷7/8

=5*9*(7/5)*(8/7)

=9*8

=728/13÷7-1/7×6/13

=8/13*(1/7)-6/13*(1/7)=(8/13-6/13)*(1/7)

=2/13*1/7

=2/91

1/5×5/8-1/5÷8/3

=1/5*5/8-1/5*3/8

=1/5*(5/8-3/8)

=1/5*1/4

=1/20

3/5÷5/8+2/5÷5/8

=(3/5+2/5)*(8/5)

=1*8/5

=8/5

x-1/2x=5/8

1/2x=5/8

x=5/8*2

x=5/4

4/5x÷2=7/16

4/5x=7/16*2

x=7/8*5/4

x=35/32

1/4x+1/3x=5/18

7/12x=5/18

x=5/18*12/7

x=10/21

1/8x÷3/10=5/18

1/8x=5/18*3/10

x=1/12*8

x=2/3

4/5x-3/4x=25

(16/20-15/20)*x=25

x=25/(1/20)

x=500

8樓:匿名使用者

(1/15+1/21)×105=7+5=12

45÷5/7÷7/8 =45*7/5*8/7 =45*8/5=72

8/13÷7-1/7×6/13 =(8-6)/(13*7)=2/91

1/5×5/8-1/5÷8/3=5/40-3/40=2/40=1/20

3/5÷5/8+2/5÷5/8=(3/5+2/5)÷5/8 =8/5

x-1/2x=5/8 , x=5/4

4/5x÷2=7/16 , 2/5 x= 7/16, x=35/32

1/4x+1/3x=5/18 , 7/12 x = 5/18, x=10/21

1/8x÷3/10=5/18 , 1/8 x =5/18*3/10, x=2/3

4/5x-3/4x=25, (16-15)/20 x =25, x=500

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