解方程一.0.2x=0.25x-18 二.0.3x+x=69

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解方程一.0.2x=0.25x-18二.0.3x+x=69解方程一.0.2x=0.25x-18二.0.3x+x=69解方程一.0.2x=0.25x-18二.0.3x+x=690.2x=0.25x-18

解方程一.0.2x=0.25x-18 二.0.3x+x=69
解方程一.0.2x=0.25x-18 二.0.3x+x=69

解方程一.0.2x=0.25x-18 二.0.3x+x=69
0.2x=0.25x-18
0.05x=18
x=18/0.05
x=360
0.3x+x=69
1.3x=69
x=690/13

(1)0.2x=0.25x-18
0.2x-0.25x=-18
0.25x-0.2x=18
0.05x=18
x=18÷0.05
x=360.
(2)0.3x+x=69
1.3x=69
x=69÷1.3
x=690/13.