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解方程x:1.2=3:43.2x-4×3=522X-34=215.

题目详情
解方程
x:1.2=3:4
3.2x-4×3=52
2X-
3
4
=
21
5
解方程
x:1.2=3:4
3.2x-4×3=52
2X-
3
4
=
21
5
解方程
x:1.2=3:4
3.2x-4×3=52
2X-
3
4
=
21
5
解方程
x:1.2=3:4
3.2x-4×3=52
2X-
3
4
=
21
5
解方程
x:1.2=3:4
3.2x-4×3=52
2X-
3
4
=
21
5



2X-
3
4
=
21
5
3
4
3 4 3 3 4 4
21
5
21 5 21 21 5 5
▼优质解答
答案和解析
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;

(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;

(3)2x-
3
4
=
21
5

2x-
3
4
+
3
4
=
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;

(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;

(3)2x-
3
4
=
21
5

2x-
3
4
+
3
4
=
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;

(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;

(3)2x-
3
4
=
21
5

2x-
3
4
+
3
4
=
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;

(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;

(3)2x-
3
4
=
21
5

2x-
3
4
+
3
4
=
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;

(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;

(3)2x-
3
4
=
21
5

2x-
3
4
+
3
4
=
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
3
4
3 4 3 3 3 4 4 4 =
21
5

2x-
3
4
+
3
4
=
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
21
5
21 5 21 21 21 5 5 5 ,
2x-
3
4
+
3
4
=
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
3
4
3 4 3 3 3 4 4 4 +
3
4
=
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
3
4
3 4 3 3 3 4 4 4 =
21
5
+
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
21
5
21 5 21 21 21 5 5 5 +
3
4

2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
3
4
3 4 3 3 3 4 4 4 ,
2x=
99
20

2x÷2=
99
20
÷2,
x=
99
40
99
20
99 20 99 99 99 20 20 20 ,
2x÷2=
99
20
÷2,
x=
99
40
99
20
99 20 99 99 99 20 20 20 ÷2,
x=
99
40
99
40
99 40 99 99 99 40 40 40 .