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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-
|
x:1.2=3:4
3.2x-4×3=52
2X-
3 |
4 |
21 |
5 |
x:1.2=3:4
3.2x-4×3=52
2X-
3 |
4 |
21 |
5 |
x:1.2=3:4
3.2x-4×3=52
2X-
3 |
4 |
21 |
5 |
x:1.2=3:4
3.2x-4×3=52
2X-
3 |
4 |
21 |
5 |
2X-
3 |
4 |
21 |
5 |
3 |
4 |
21 |
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-
=
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
. (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-
=
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
. (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-
=
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
. (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-
=
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
.
3 4 3 3 3 4 4 4 =
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
.
21 5 21 21 21 5 5 5 ,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
.
3 4 3 3 3 4 4 4 +
=
+
,
2x=
,
2x÷2=
÷2,
x=
.
3 4 3 3 3 4 4 4 =
+
,
2x=
,
2x÷2=
÷2,
x=
.
21 5 21 21 21 5 5 5 +
,
2x=
,
2x÷2=
÷2,
x=
.
3 4 3 3 3 4 4 4 ,
2x=
,
2x÷2=
÷2,
x=
.
99 20 99 99 99 20 20 20 ,
2x÷2=
÷2,
x=
.
99 20 99 99 99 20 20 20 ÷2,
x=
.
99 40 99 99 99 40 40 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-
2x-
2x=
2x÷2=
x=
|
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 |
x=
99 |
40 |
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 |
x=
99 |
40 |
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 |
x=
99 |
40 |
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 |
x=
99 |
40 |
3 |
4 |
21 |
5 |
2x-
3 |
4 |
3 |
4 |
21 |
5 |
3 |
4 |
2x=
99 |
20 |
2x÷2=
99 |
20 |
x=
99 |
40 |
21 |
5 |
2x-
3 |
4 |
3 |
4 |
21 |
5 |
3 |
4 |
2x=
99 |
20 |
2x÷2=
99 |
20 |
x=
99 |
40 |
3 |
4 |
3 |
4 |
21 |
5 |
3 |
4 |
2x=
99 |
20 |
2x÷2=
99 |
20 |
x=
99 |
40 |
3 |
4 |
21 |
5 |
3 |
4 |
2x=
99 |
20 |
2x÷2=
99 |
20 |
x=
99 |
40 |
21 |
5 |
3 |
4 |
2x=
99 |
20 |
2x÷2=
99 |
20 |
x=
99 |
40 |
3 |
4 |
2x=
99 |
20 |
2x÷2=
99 |
20 |
x=
99 |
40 |
99 |
20 |
2x÷2=
99 |
20 |
x=
99 |
40 |
99 |
20 |
x=
99 |
40 |
99 |
40 |
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