问题 解答题
解方程
x
2
+5x=110
28
3x
=
49
9
×
9
7
24:
3
2
=3.2:x.
答案

(1)

x
2
+5x=110,

x+10x=220,

11x=220,

11x÷11=220÷11,

x=20;

(2)

28
3x
=
49
9
×
9
7

28
3x
=7,

21x=28,

21x÷21=28÷21,

x=

4
3

(3)24:

3
2
=3.2:x,

24x=4.8,

24x÷24=4.8÷24,

x=0.2.

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