[20-x]*[32-x]=570
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X+1-3X=5X+105x+3x-x=-10+17x=-9x=-9/76-3X=5X-205x+3x=20+68x=26x=13/4一、已知M-N=3,则9-2M+2N==9-2(M-N)=9-6=
2x+3x+5x=3210x=32x=3.2
(x-20%x)+5=x-3(x-x/5)+5=x-3(5x-x)+25=5x-1525=x-15x=40再问:括号里面怎么算的
是这样的:x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)
8x+20=5x+323x=12x=47x-80=5x-202x=60x=3086+4x=108-x5x=22x=4.4
32x-7x-5x=420(32-7-5)x=42020x=420x=21
原式=4x-60x+3x^2=5x-140x+7x^24x^2-79x=0x=0或者x=7/4
(0.2x+25)/(0.8x-25)=5/65(0.8x-25)=6(0.2x+25)4x-125=1.2x+1502.8x=275x=1375/14
5x-20*5=3x5x-3x=20*52x=100x=100÷2x=50
(x-22)+(x-24)+(x-27)+(x-20)=xx-22+x-24+x-27+x-20=x4x-93=x4x-x=933x=93x=31
4x-60x+3x*x=5x-140x+7x*x4x*x-79x=0x(4x-79)=0x=0或x=79/4
32x-7x-5x=42020x=420x=21
5X+5=20-2X+605x+2x=20+60-57x=75x=75/7
14x-6x²+10x²+5x=4x²-3x+3222x=32∴x=16/11
50%x=2再答:x=4再答:1.2x=2.4再答:x=2再答:1.05x=4.2再答:x=4再答:0.5x=0.2再答:x=0.4再答:请采纳再问:可不可以把式子、过程、答案合并在一起再答:那就是过
#includesintjiesheng(intn)//用于计算阶乘如:3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x
你懒惰了,通分得:50x=300x=6
4x+5x=20(4+5)x=209x=209x/9=20/9x=20/9
50x/60=5x=6