解方程啦，送分啦~~~快进吧
\u89e3\u65b9\u7a0b\uff0c\u5feb\u8fdb50%X +50= X - 30%X
\u89e3\uff1a0.5X+50=0.7X
0.7X-0.5X=50
0.2X=50
X=50\u00f70.2
X=250
(1-2/3)x=(1-1/4)(x-35)
1/3x=3/4(x-35)
4x=9(x-35)
9x-4x=315
5x=315
x=63
\u5982\u679c\u5e2e\u5230\u4f60\uff0c\u8bf7\u8bb0\u5f97\u91c7\u7eb3\uff0cO(\u2229_\u2229)O\u8c22\u8c22
400-40x+200x-20x平方=640
x平方+8x+12=0
解得x=-2,x=-6
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