（20+X）（14+X）=
    （20+X）（14+X）=
    X²+34X+280-72=0
    144+（a-2）^2＝a^2
    x^2-34x-300
    x^2-106x-300
    x^2-106x+300
    -x^2+208x+74000
    (x-1974)/x=13.05%
    -3x^4-36x^3-178x^2-420x-300
    -3x^4-36x^3-188x^2-420x-300
    -（1/30）xx+8/3x=8
    -20a^2+840a+5000=0
    x^2+x+1
    （x-60) (-x+100)=(x-75)[-2(x-25)+150]
    sin(x)=3
    (15-x)(400+5x)=4250
    lg(x²+12)=4lg(x)
    y^2+y(4-y^2)^1/2+2(1-2y^2)^1/2-1
    X/(X+5)=87.5%

Home page << page78 page79 page80 page81 page82 ... ... page84 page85 page86 page87 page88 >> Last page 31278 pages in total