1樓:匿名使用者
3/4÷[3/5+2/5×(1-3/8)]=3/4÷【3/5+2/5x5/8】
=3/4÷【3/5+1/4】
=3/4÷17/20
=3/4x20/17
=15/17
2樓:匿名使用者
3/4÷[3/5+2/5×(1-3/8)]=3/4÷[3/5+2/5×(5/8)]
=3/4÷(3/5+1/4)
=3/4÷(17/20)
=15/17
3樓:匿名使用者
3/4÷[3/5+2/5×(1-3/8)] =3/4÷[3/5+2/5×5/8]=3/4÷[3/5+2/8]=3/4÷[3/5+1/4]
=3/4 x÷(17/20)
=15/17
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÷
4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
3+56÷0.8-5.7 (3/4×1/6+3/4×5/6)÷3/2簡便計算
5樓:匿名使用者
寶寶你多大了,幾年級,這些題遵循一個原則,先括號在括號外,先乘除再加減,你試試
6樓:凌月霜丶
3+56÷0.8-5.7
=3+70-5.7
=73-5.7
=67.3
(3/4×1/6+3/4×5/6)÷3/2簡便計算(3/4×1/6+3/4×5/6)÷3/2=3/4*(1/6+5/6)÷3/2
=3/4*1*2/3
=1/2
3/5×[1/2+(5/8÷3/4)]
7樓:匿名使用者
3/5×(1/2+5/6)=3/5×(3/6+5/6)=3/5×4/3=4/5
34/15-(4/15+2/5) 2-3/8÷7/16-1/7 5/12÷8+1/8×7/12 2/3×8/5+1/3÷5/8 (1/4-1/20)×40
8樓:匿名使用者
第一個題要是能寫清楚點就好了 感覺有點亂 不過按順序一一算能算出來
3/4×【(7/15-1/5)÷2/3】=3/4×3/2×(7/15-1/5)
=3/4×3/2×(7/15-3/15)
=3/4×3/2×4/15
= 3/10
3/5×(1/7+8/21÷2/3)=3/5×(1/7+4/7)=3/5×5/7=3/7
(2/3-3/4×1/3)÷5/4=(2/3-1/4)×4/5=2/3×4/5-1/4×4/5
=8/15-3/15
=5/15
=1/3
1/2-8/9÷5/6×3/16 =1/2-1/5=3/10
(5/12+1/9-3/8)×72 = 5/12×72 +1/9×72 -3/8 ×72
=30 +8-27
=5【1-(75%+1/12)】×3/2=【1-(3/4+1/12)】×3/2
=【1-5/6】×3/2
=1/6×3/2
=1/4
9樓:百度使用者
()*3/2=4/3,5/2÷()=5/4
4/5×7/8+7/8÷5(簡便計算) (1—8/15×3/4)÷3/5(簡便計算) 1—5/8÷
10樓:溫柔_黏喻勊
計算器1-5/8/25/28-3/10 = 0.69910714285714
計算器4/5*7/8+7/8/5 = 0.875
4/7÷[2/3×(1-5/8)]的簡便方法?
11樓:妙酒
脫式計算
4/7÷[2/3×(1-5/8)]
=4/7÷(2/3×3/8)
=4/7÷1/4
=16/7
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