作业帮30x减20x等于551
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x/6-3=x/7+542(x/6-3)=42(x/7+5)7x-126=6x+2107x-6x=210+126x=336
(1-0.3)x=0.7x(1+0.2)x=1.2x
X-20％X=40x-0.2x=400.8x=40x=50
x=3x+20=4x-25先解x=3x+20-20=3x-x-20=2xx=-10再解3x+20=4x-2520+25=4x-3xx=45即方程x=3x+20=4x-25无解.
x/30-2=x/35等式分母同时乘以2107x-420=6x7x-6x=420x=420
x^4-x²=6x^4-x²-6=0(x²+2)(x²-3)=0(x²+2)(x+√3)(x-√3)=0∵x²+2≥2∴x1=-√3,x2=
x-10+30＝2x2x-x=30-10x=20
20=x-(√3x/3)20=(3-√3)x/3x=60/(3-√3)x=60*(3+√3)/6x=10(3+√3)x=30+10√3
先通分变成18X-18360=X解得X=1080
40%:20=x:1520x=15×40%20x=6x=6÷20x=0.3
x-3分之2x=153分之1x=15x=15÷3分之1x=15×3x=45再问：5（x减6.8）等于10.5求x是多少再答：5（x-6.8）=10.55x-5×6.8=10.55x-34=10.55x
再问：eko再答：лл
x/5+x=326x/5=32x=80/32x/5-x/4=243x/20=24x=16030%x=45x=4500/30=150X+12%X=2.241.12x=2.24x=2
(x-1)(x+2)(x+3)(x+6)+20=0(x-1)(x+6)(x+2)(x+3)+20=0(x^2+5x-6)(x^2+5x+6)+20=0(x^2+5x)^2-36+20=0(x^2+5x
x-3分之1x-6分之1x=30两边同时乘以6得6x-2x-x=1803x=180x=60
9x-x=8x
x-720=x/54x/5=720x=900
二分之一x减三分之一x等于八乘以6得3x-2x=48x=48
9.5x减x等于8.5x
x^2-x=20x^2-x-20=0x^2-16-x-4=0(x^2-4^2)-(x+4)=0(x+4)(x-4)-(x+4)=0(x+4)(x-4-1)=0(x+4)(x-5)=0x=-4或x=5