⑴7x+3=3(5x+2)-2(-3x) ⑵5（x-3）=3(2x+2)-(2-x)

来源：学生作业帮助网编辑：作业帮时间：2024/11/03 00:38:07

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⑴7x+3=3(5x+2)-2(-3x) ⑵5（x-3）=3(2x+2)-(2-x)
⑴7x+3=3(5x+2)-2(-3x) ⑵5（x-3）=3(2x+2)-(2-x)

⑴7x+3=3(5x+2)-2(-3x) ⑵5（x-3）=3(2x+2)-(2-x)
⑴7x+3=3(5x+2)-2(-3x)
7x+3=15x+6+6x
15x+6x-7x=3-6
14x=-3
x=-3÷14
x=-3/14
⑵5（x-3）=3(2x+2)-(2-x)
5x-15=6x+6-2+x
6x+x-5x=-15-6+2
2x=-19
x=-19÷2
x=-19/2

设要x小时
1小时进水1/2，出水1/3
所以x/2-x/3=5/6
x(1/2-1/3)=5/6
x(1/6)=5/6
x=5/6÷1/5
x=5
答：需要5小时灌到满池的5/6

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