(10 x)(40-x)=6000

x+2x×10=10x+2x+36x+20x=12x+3621x-12x=369x=36x=4

（x+x+三分之一x)乘以3=3087x=308x=440.3x+0.2乘以（160-x)=360.3x+32-0.2x=360.1x=4x=40x+10=40%乘以（36-x+0）x+10=14.4

(9X+8)(-9X+80)=1855-81X^2+648X+640-1855=0X^2-8X+15=0X=3或5

5X+10（40-X）=3605X+400-10X=360400-5X=3605X=40X=8

(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=(x/2)*(2/x(x+2))+(2/(x+2)(x+4))+.+2/(x+8)(x+10)=(x/2)*[1/x

X/(x-30)=(x+40)/XX^2=(X-30)*(X+40)X^2=X^2+40X-30X-120010X=1200X=120

原方程可化为100*{(X+X*20%)-[(1200-X)-(1200-X)*20%]}=40%*100100*120%X-100*[(1200-X)-(1200-X)*20%]=40120X-10

X=32

X+X*20%-(1200-X)-(1200-X)*20%=40%,等式左右同时乘以100得100X+X*20-100*(1200-X)-(1200-X)*20=40120X-(1200-X)*120

（X+X)+(X-X)+(X*X)+(X/X)=1002X+0+X*X+1=1002X+X*X=99X(X+2)=99X=9再问：请问X(X+2)=99解为什么就等于9了呢没看懂再答：换成算术法你就明

(x+10)[-10(x-60)]=10000(x+10)(x-60)=-1000x²-50x-600+1000=0x²-50x+400=0(x-10)(x-40)=0x=10,x

同时乘6060×（x/15+x/12+x/10）=1365×604x+5x+6x=8190015x=81900x=81900÷15x=5460很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选

X+30%X=52(1+30%)x=521.3x=52x=52÷1.3x=40X-10%x=27(1-10%)x=270.9x=27x=27÷0.9x=3020%x+24=4020%x=40-240.

就是当x!=0时进入循环

呃...的确是一元二次方程...(X-30)*[600-(X-40)*10]=10000(X-30)*(600-10X+400)=10000(X-30)*(1000-10X)=100001000X-1

60%x+25=400.6x=40-250.6x=15x=25x+30%x=521.3x=52x=4019-120%x=719-7=1.2x1.2x=12x=10x-10%x=180.9x=18x=2

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三分之一X+四分之一X+三分之一X-10=X12/4x+12/3x+10/4x-10=x12/11x-10=x12/11x-x=1012/1x=-10x=-120

=x^2+10x-24+x^2+15x+56-x^2+5x+50=x^2+30x+82=4+60+82=146其实,不化简,直接代入=14*0+9*10+7*8=0+90+56=146也很简单

10%+20%(1100-x)=20010%x+220-20%=200220-10%=20010%x=20x=200600x+1000(150-x)=100000600x+150000-1000x=1