（156-X）/156=48%
    （156-X）/156=48.8%
    （123-X）/123=48.8%
    （123-X）=48.8%
    xxx-4x-4=0
    x-2-(2-x)/2=(x-2)/3
    5x-3(5/21)=5/7
    x(3/5)=20(1/4)
    5x-(2/7)x=3/4
    (3x+5)/2=(5x-9)/3
    3(x+2)/5=(x+2)
    2(3x-4)+(4-x)=4x
    3(x+1)/(2x-4)=6
    1.7x+4.8+0.3x=7.8
    128-5(2x+3)=73
     x*x-192*x+96*96 = 1.645*1.645*x
    x2-192*x+96*96=1.645*1.645*x
    7(4-X)=9(X-4)
    3 -X=2 -5(X -1)
    2（x-1）=4

Home page << page658 page659 page660 page661 page662 ... ... page664 page665 page666 page667 page668 >> Last page 31235 pages in total