作业帮2.5*20*0.8x=58
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（20-2x)(20-2x)x>400400-80x+4x²>400x²-20x＞0x(x-20)＞0x＜0x＞20
6x+1.5x=97.5x=9x=9/7.5X=1.218-0.2X=80.2X=18-8X=10/0.2X=50X-0.25=0.8X=0.8+0.25X=1.05
0.5x=15x=30再答：0.2x=10x=50再答：4.5x=9x=2再问：能写内容
6x=24x=41.58*4=6.3210x=8x=0.870*0.8-29.5=26.5再问：确定答案吗？直接采纳喽
x/4=30%x=4*30%=120%36/x=3/43x=36*4x=36*4/3=4810/x=2.5/0.82.5x=10*0.8x=10*0.8/2.5=3.2x/4=1.2/55x=4*1.
2.5%X+20*2.25%-2.25%X=0.4850.25%X+20*2.25%=0.4850.25%X=0.485-20*2.25%0.25%X=0.485-0.450.25%X=0.035X=
x-60%x=2400.4x=240x=600x+20%x=241.2x=24x=201-25%x=十六分之三1-3/16=x/413/16=x/4x=13/4160%x-x=90.6x=9x=155
20+0.8x=x-14x-0.8x=20+140.2x=34x=170112-4x=2x(80-4x)112-4x=160-8x8x-4x=160-1124x=48x=12
4.2+2.4=2.5x+0.8x3.3x=6.6x=2
x-0.8x=46(1-0.8)x=460.2x=46x=46÷0.2x=230如果帮到你,请记得采纳,O(∩_∩)O谢谢
(x-22)+(x-24)+(x-27)+(x-20)=xx-22+x-24+x-27+x-20=x4x-93=x4x-x=933x=93x=31
X-0.8X=20.2X=2X=2/0.2X=10
各分式减1,得1/（x+2004)+1/(x+2006)=1/(x+2007)+1/(x+2003),通分得（2x+4010)/[（x+2004)(x+2006)]=(2x+4010)/[(x+200
x-4x=102-3x=102x=-34x-0.8x=220.2x=22x=110
0.2x=16x=80
0.88x+0.88*20%x=x+841.056x=x+84x=1500
（1）20%X+30%X=2.5 50%X=2
4×(0.8＋x)＝723.2＋4x＝724x＝72－3.24x＝68.8x＝68.8÷4x＝17.28x＋2x＝31.410x＝31.4x＝31.4÷10x＝3.14(x＋1.8)÷4＝2.5(x＋
两边同乘x*(x+0.5)化简的0.4x*x+x-50=0,所以x=10或-12.5
(1)2x-0.8×2.6=3.08-2x4x-2.08-3.08=04x-5.08=0x=1.27(2)2.4×0.2x=0.5x-2.44.8x-0.5x=2.44.3x=2.4x=24/43(3