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求未知数x(1)23x+12x=42 (2)10...
求未知数x(1)23x+12x=42 (2)10÷(x4+1 )=8(3)x:4.2=6:3.5 (4)14:116=x:120.
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推荐答案 推荐于2016-05-09
(1)
2
3
x+
1
2
x=42
7
6
x=42
7
6
x
÷
7
6
=42
÷
7
6
x=36
(2)10÷(
x
4
+1 )=8
10÷(
x
4
+1 )×
(
x
4
+1)
=8×
(
x
4
+1)
2x+8=10
2x+8-8=10-8
2x÷2=2÷2
x=1
(3)x:4.2=6:3.5
3.5x=4.2×6
3.5x=25.2
3.5x÷3.5=25.2÷3.5
x=7.2
(4)
1
4
:
1
16
=x:
1
20
1
16
x=
1
4
×
1
20
1
16
x=
1
80
1
16
x
÷
1
16
=
1
80
÷
1
16
x=
1
5
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相似回答
(1)23x+12x=42
(2)
x10=0.84.5.
答:
(1)23x+12x=42
, (23+12)x=42, 76x=42, 76x×67=42×67, x=36;
(2)
x10=0.84.5, 4.5x=8,4.5x÷4.5=8÷4.5, x=169.
求未知数X
.
23X+12X=42
X:0.3=0.4:0.8
答:
(1)23X+12X=42
, 解:76X=42, 76X÷76=42÷76, X=36,
(2)X
:0.3=0.4:0.8, 解:0.8X=0.3×0.4, 0.8X÷0.8=0.3×0.4÷0.8, X=0.15;(3)1.25:0.25=X:1.6, 解:0.25X=1.25×1.6, 0.25X÷0.25=1.25×1.6÷0.25...
解方程
23x+12x=42
; &nb...
答:
(1)23x+12x=42
76x=42 76x×67=42×67 x=36
(2)x
:38=23:4 4x=38×23 4x÷4=14÷4 x=116
求未知数x
.(l)328=x15
(2)23x+12x=42
答:
(l)328=x15, 28x=3×15, 28x÷28=3×15÷28, x=4528;
(2)23x+12x=42
, 76x=42, 76x÷76=42÷76, x=36.
解方程.
(1)
4÷
23(x
?1
)=
25
(2)23x+12x=42
(3)6x+4.5=9x-1.2(4)(47x):23...
答:
1)
]=4÷25, 23(x?1)×32=
10
×32, x-
1+
1=15+1, x=16;
(2)23x+12x=42
, 76x=42, 76x×67=42×67, x=36; (3)6x+4.5=9x-1.2, 6x+4.5-6x=9x-1.2-6x, 4.5+1.2=3x-1.2+1.2, 5.7÷3=3x÷3, x=1.9; (4...
求未知数x
.120
x=
0.361.8 ...
答:
(1)
120x=0.361.8 0.36x=120×1.8 0.36x÷0.36=216÷0.36 x=600;
(2)23x
-
12x=42
16x=42 16x÷16=42÷16 x=252.
求未知数X
:
(1)12x+23x=
56
(2)
3.2:4=12:X.
答:
(1)12x+23x=
56, 76x=56, 76x÷76=56÷76, x=57;
(2)
3.2:4=12:x, 3.2x=4×12, 3.2x=2, 3.2x÷3.2=2÷3.2, x=0.625.
求未知数x
.19-120%x=7
2 3 x+ 1 2 x=42
36 x = 1.8 5 1
答:
19-7=7+120%x-7, 12÷120%=120%x÷120%, x=
10
;
(2) 2 3 x+ 1 2 x=42
, 7 6 x ÷ 7 6 =42 ÷ 7 6 , x=36;(3) 36 x = 1.8 5 , 1.8x=36×5,1.8x÷1.8=180÷1.8, x=100;(...
求未知数
χ.
(1)23
χ
+2
×5=16
(2)
4χ-50%χ=10.5 &...
答:
(1)23x+
2×5=16, 23x+10=16, 23x+10-10=16-10, 23x×32=6×32, x=9;
(2)
4x-50%
x=10
.5, 3.5x=10.5, 3.5x÷3.5=10.5÷3.5, x=3;(3)310:15=x:50, 15
x=
310×50, 15x×5=15×5, x=75.
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