1樓:巨集哥
=9/22÷〔2/7*7/20〕
=9/22÷1/10
=45/11
9/20÷[2/7×(3/4-2/5)]簡便運算?
2樓:陳長的路上
9/20÷[2/7×(3/4-2/5)]
=9/20÷[2/7×7/20]
=9/20÷(1/10)
=(9/20) x10
=9/2
脫式計算,能簡便的要簡便。 23/25除以(3/4+2/5) 1/7x9/13除以5/14除
3樓:瑩星
23/25÷
(3/4+2/5)
=23/25÷23/20
=23/25×20/23
=4/5
1/7×9/13÷5/14÷3/13
=1/7×9/13×14/5×13/3
=6/5
=1又1/5
15/16÷(5/12÷5/8+3/8)
=15/16÷(2/3+3/8)
=15/16÷25/24
=9/10
(2/3-1/2+1/6)÷1/24
=(2/3-1/2+1/6)×24
=16-12+4=8
能簡便的用簡便方法。(2/3一2/5)×(3/4÷4/5)=
4樓:匿名使用者
能簡便的用簡便方法。(2/3一2/5)×(3/4÷4/5)=(2/3-2/5)*(3/4*5/4)
=(2/3-2/5)*15/16
=2/3*15/16-2/5*15/16
=5/8-3/8
=2/8
=1/4
5樓:匿名使用者
(2/3一2/5)×(3/4÷4/5)
= (2/3一2/5)×3/4×5/4
=2/3×3/4×5/4-2/5×3/4×5/4=1/2×5/4-2/5×5/4×3/4
=5/8-1/2×3/4
=5/8-3/8
=1/4
2/7÷(2/5)-5/9×3/10能用簡便方法計算嗎?
6樓:樂為人師
2/7÷(2/5)-5/9×3/10能用簡便方法計算嗎?
解析:2/7÷(2/5)-5/9×3/10不能用簡便方法計算:
2/7÷(2/5)-5/9×3/10
=5/7-1/6
=23/42
7樓:美麗滴月
可以2/7*5/2-5/9*3/10
=5/7-1/6
=23/42
約為0.55
脫式計算,能簡便要簡便。 3/5×1/5÷3/5 2/7-5/8×2/7 1/4÷2/3+2/3÷
8樓:匡吉月卷翼
脫式計算,能簡便要簡便。
3/5×1/5÷3/5
=3/5÷3/5×1/5
=1/5
2/7-5/8×2/7
=(1-5/8)×2/7
=3/8×2/7
=3/28
1/4÷2/3+2/3÷4
=3/2÷4+2/3÷4
=(3/2+2/3)÷4
=13/6÷4
=13/24
1/3÷1/5+4/5
=5/3+4/5
=37/15
[1-(1/4+3/8)]÷1/4
=(1-5/8)×4
=3/8×4
=3/2
4/9×3/16+5/12
=1/12+5/12
=1/2
3/9-1/3×3/9
=(1-1/3)×1/3
=2/9
解方程1/2x÷1/4=8
1/2x=2
x=41/4x+2/3=3
1/4x=3-2/3
1/4x=7/3
x=28/3
1/3x+1/2x=5
5/6x=5
x=62/5x+1/3×6=4
2/5x=4-2
2/5x=2
x=52/7x=1/2×3/14
2/7x=3/28
x=3/8
4.5x+x=11/17
5.5x=11/17
x=2/17
x-1/12x=22
11/12x=22
x=24
7/10-(3/4-2/5)簡便計算?
9樓:匿名使用者
=14/20-15/20+8/20
=14/20+8/20-15/20
=22/20-15/20
=7/20
2又2/3÷(9/2)+2又2/3×7/9的簡便方法?
10樓:樂為人師
2又2/3÷(9/2)+2又2/3×7/9的簡便方法2又2/3÷(9/2)+2又2/3×7/9=2又2/3×2/9+2又2/3×7/9
=2又2/3×(2/9+7/9)
=2又2/3×1
=2又2/3
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