(300-X)除以3 3X=200
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x÷60-x÷90=20x/60-x/90=20x/180=20x=3600
(x+7)/(x+6)+(x+9)/(x+8)=(x+10)/(x+9)+(x+6)/(x+5)(x+9)/(x+8)-(x+10)/(x+9)=(x+6)/(x+5)-(x+7)/(x+6)[(x+
8÷0.01=2x/3800×3=2xx=1200
你的式子是不是这样的:(x/4)²+[(20-x)/4]²=17(x/4)²+[(20-x)/4]²+2(x/4)[(20-x)/4]=17+2(x/4)[(2
(17/20)/x=3434x=17/202x=1/20x=1/40
X除以(X-2)+(X-9)除以(X-7)=(X+1)除以(X-1)+(X-8)除以(X-6)(x-2+2/x-2)+(x-7-2/x-7)=(x-1+2/x-1)+(x-6-2/x-6)1+(2/x
x/20%-x=4005x-x=4004x=400x=100
1.6÷2÷x=200.8÷x=20x=0.8÷20x=0.04
20x=36x-28816x=288x=18
(X-5)÷80%=X+70X-5=80%(X+70)X-5=0.8(X+70)X-5=0.8X+56X-0.8X=56+50.2X=61X=305
(X-75)除以20=(X+100)除以15两边乘603(X-75)=4(X+100)3X-225=4X+4003X-4X=400+225-X=625X=-625再问:验算不对啊
再答: 再答: 再问:我看得清、
你题目发错了吧
x×(13-x)÷2=20x×(13-x)=40x^2-13x+40=0(x-5)(x-8)=0X1=5X2=8
X除以(X-80)=3x=3(x-80)x=3x-2403x-x=2402x=240x=120
x=10
45%x÷(x+16)=25%45%x=25%(x+16)0.45x=0.25x+40.2x=4x=20