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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