1又2/5除以（X-45%）=2.8解方程

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1又2/5除以（X-45%）=2.8解方程7/5=2.8x -1.262.8x =2.66x = 0.95...

千问 | 2013-5-30 22:05:59 | 显示全部楼层

1又2/5除以（X-45%）=2.87/5除以（X-45%）=14/5X-45%=7/5*5/14X-45%=1/2x=0.95...

千问 | 2013-5-30 22:05:59 | 显示全部楼层

(7/5)/(x-45%)=2.81/(5x-5*0.45)=0.45x-2.25=1/0.45x=2.25+2.55x=4.75x=0.95...

千问 | 2013-5-30 22:05:59 | 显示全部楼层

(7/5)/(x-0.45)=2.87/5=2.8(x-0.45) =2.8x-2.8*0.452.8x=7/5+2.8*0.45
=1.4+1.26
=2.66 x=2.66/2.8=0.95...

千问 | 2013-5-30 22:05:59 | 显示全部楼层

7/5/（X-45%）=2.87/5除以14/5=X-45%0.5=X-45%x=0.95...

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