作业帮75X (50-x)90=50*81
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x加30%x=521.3x=52x=52×1.3x=40x减40%x=150.6x=15x=15÷0.6x=2550%x加x=31.51.5x=31.5x=31.5÷1.5x=21x减1%x=19.8
75%X-50=220.75x=22+500.75x=72x=96
6000/(x+50)+3000/x=9000/(x+30)化简：2/(x+50)+1/x=3/(x+30)等式两边同乘x(X+50)(X+30)2X(X+30)+(X+50)(X+30)=3x(X+
3x=x+1003x-x=1002x=100x=100/2x=50
90/(x-90)=(2x-50)/(x+50)(2x-50)(x-90)=90(x+50)2x^2-230x+4500=90x+45002x^2-230x-90x+4500-4500=02x^2-3
x-60%x+28=50%x-9x-0.6x+28=0.5x-90.4x+28=0.5x-90.5x-0.4x=28+90.1x=37x=370
X-(0.2X+0.2X+50)=70X-0.4X-50=700.6X=120X=200
x+40%=140x=140-0.4x=139.675%x+90=1500.75x=150-900.75x=60x=80（4.5减50%）x=1804x=180x=45
x+75%x=1407x/4=140x=140*4/7x=80x-40%x=960.6x=96x=96/0.6x=160x-76%x=362.4x=36x=36/2.4x=154x+50%x=904.
x/50-x/75=10两边同乘150得到3x-2x=1500x=1500
x-25%X-(25%x-25)=50x-0.25X-0.25X+25=500.5X=25X=50再问：很快，谢谢你
30X+90=60(X-50)30X+90＝60X－300060X－30X＝3000＋9030X＝3090X＝103
50X+40X×(2.5X)=12050X+100X=120150X=120X=120/150X=0.8
1.5X+20=1X（50-X)1,5x+20=50-x1.5x+2=50-202.5x=30x=12
20%x+[25*20%x]+12=50%x+20.2x+5x+12=0.5x+24,7x=-10x=-100/47
(60%x-28)+(50%x+9)=X60%x-28+50%x+9=X(60%+50%)x-19=x1.1x-x=19(1.1-1)x=19x=190
3.14*0.5x³=50x³=100/3.14x约等于3.170
等于(x-1)(x-2)(x-3)(x-4)...(x-50)的导数
130%x+x=4.61.3x+x=4.62.3x=4.6x=2x÷50%=10x=10乘2x=20x/9-x/15=16%x（1/9-1/15）=16/100x（5/45-3/45）=4/25x=4