解方程①60%x+25=95②3x+9=36③5x-(8-3x)=72
解方程①60%x+25=95②3x+9=36③5x-(8-3x)=72....
解方程①60%x+25=95②3x+9=36③5x-(8-3x)=72.
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佩着玩i
2014-12-19
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(1)60%x+25=95,
60%x+25-25=95-25,
0.6x÷0.6=70÷0.6,
x=116
;
(2)3x+9=36,
3x+9-9=36-9,
3x÷3=27÷3,
x=9;
(3)5x-(8-3x)=72,
5x-8+3x=72,
8x-8+8=72+8,
8x÷8=80÷8,
x=10.
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