1樓:妙酒
1/4 ÷ (1-5/9)+3/8
=1/4 ÷ 4/9+3/8
=9/16+6/16
=15/16
13/15+1/2÷(4/5)+3/8用簡便方法計算
2樓:匿名使用者
13/15+1/2÷(4/5)+3/8用簡便方法計算解:採用結合律,
原式=13/15+1/2÷(4/5)+3/8=13/15+1/2x5/4+3/8
=13/15+(5/8+3/8)
=13/15+1
=1又13/15
3樓:妙酒
=13/15+5/8+3/8
=13/15+1
=1又13/15
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4樓:匿名使用者
中間的等於八分之五,再加八分之三等於一,這樣算簡便方法嗎。
5樓:龔成素
=13/15+1/2x5/4+3/8
=13/15+(5/8+3/8)
=13/15+1
=1又13/15
簡便計算【要過程,要簡便】4/9÷【4/5-(1/5+1/3)】
6樓:匿名使用者
4/9÷【4/5-(1/5+1/3)】
=4/9÷(4/5-1/5-1/3)
=4/9÷(3/5-1/3)
=4/9÷(9/15-5/15)
=4/9÷4/15
=4/9×15/4
=5/3
(5/8-1/4)÷(8/9+1/3)
7樓:匿名使用者
(5/8-1/4)÷(8/9+1/3)=3/8÷11/9=27/883/8+3/4×2/3÷6=3/8+1/2÷6=3/8+1/12=11/24
(1/4+1/5)×4×5=9/20×4×5=93/5+(1-7/10)÷3/20=3/5+3/10×20/3=3/5+2=13/5
4.5x+0.2x=6.1
4.7x=6.1
x=61/47
3/4x-1/3=5/6
3/4x=5/6+1/3
3/4x=7/6
x=14/9
希望你能採納,評為最佳答案,謝謝!
8樓:匿名使用者
1.原式=(5/8-2/8)÷(8/9+3/9)=(3/8)÷(11/9)=27/88
2.原式=3/8+1/2x1/6=3/8+1/12=9/24+2/24=11/24
3.原式=(5/20+4/20)x20=(9/20)x20=94.原式=3/5+(3/10)÷(3/20)=3/5+2=13/55.
原方程變為4.7x=6.1,解得:
x=61/476.原方程變為(3/4)x=5/6-1/3,即(3/4)x=1/2,所以x=(1/2)x(4/3)=2/3
9樓:世紀風霜
(5/8-1/4)÷(8/9+1/3)
=(5/8-2/8)÷(8/9+3/9)
=3/8÷11/9
=3/8×9/11
=27/88
3/8+3/4×2/3÷6
=3/8+1/2÷6
=3/8+1/2×1/6
=3/8+1/12
=9/24+2/24
=11/24
(1/4+1/5)×4×5
=1/4+×4×5+1/5×4×5
=1×5+1×4
=5+4
=93/5+(1-7/10)÷3/20
=3/5+3/10÷3/20
=3/5+2
=3/5+10/5
=13/5
4.5x+0.2x=6.1(方程)
4.7x=6.1
x=47/61
3/4x-1/3=5/6(方程)
3/4x=5/6+1/3
3/4x=5/6+2/6
3/4x=7/6
x=7/6÷3/4
x=7/6×4/3
x=14/9
10樓:淺愛琉璃
(5/8-1/4)÷(8/9+1/3)
=(5/8-2/8)÷(8/9+3/9)
=(3/8)÷(11/9)
=3/8 *9/11
=27/88
(5/8-1/4)÷(8/9+1/3)
11樓:妙酒
(5/8-1/4)÷(8/9+1/3)
=3/8÷11/9
=27/88
(5/8-1/4)÷(8/9+1/3)?
12樓:匿名使用者
1( 5/8 - 1/4 ) ÷ ( 8/9 + 1/3 )= ( 5/8 - 2/8 ) ÷ ( 8/9 + 3/9 )= 3/8 ÷ 11/9
= 3/8 ×
9/11
= 27/88
2 3/8 + 3/4 × 2/3 ÷ 6= 3/8 + 12/12 ÷ 6
= 3/8 + 6/12
= 3/8 + 1/2
= 3/8 + 4/8
= 7/8
3 (1/4 + 1/5)×4×5
= (1/4 + 1/5)× 20
= 1/4 × 20 + 1/5 × 20= 5 + 4
= 94 3/5 +(1 - 7/10)÷ 3/20= 3/5 + 3/10 × 20/3
= 3/5 + 60/30
= 3/5 + 2
= 3/5 + 10/5
= 13/5
5 4.5x + 0.2x = 6.1
4.7 x = 6.1
x = 6.1 / 4.7
x = 61/47
6 3/4x - 1/3 = 5/6
(3/4) x = 5/6 + 2/6
(3/4) x = 7/6
x = 7/6 ÷ 3/4
x = 7/6 × 4/3
x = 28/18
x = 14/9
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