问题 解答题
解方程.
X+
7
12
=5
X÷0.5=5.2X-0.2=5.633X=1.3+215-X=2.4
1
4
+X=
3
5
答案

(1)x+

7
12
=5,

x+

7
12
-
7
12
=5-
7
12

x=4

5
12

(2)x÷0.5=5.2,

x÷0.5×0.5=5.2×0.5,

x=2.6;

(3)x-0.2=5.6,

x-0.2+0.2=5.6+0.2,

x=5.8;

(4)33x=1.3+2,

33x=3.3,

33x÷33=3.3÷33,

x=0.1;

(5)15-x=2.4,

15-x+x=2.4+x,

15=2.4+x,

15-2.4=24+x-2.4,

x=12.6.

(6)x+

1
4
=
3
5

x+

1
4
-
1
4
=
3
5
-
1
4

x=

7
20

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