x-0.8x=18
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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
1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2(x+9)(1/3)×[3/x(x+3)+3/(x+3)(x+6)+3/(x+6)(x+9)]=3/2(x+9)(1/3)[
(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
0或41分之3200,用公式法解再问:是41分之80根号41....
x(x-1)=18x-x=18x-x+1/4=18+1/4(x-1/2)=73/4x=1/2±√73/2
x^4-4x^3-4x^2+15x+18=0x^4-3x^3-x^3+3x^2-7x^2+21x-6x+18=0(x-3)(x^3-x^2-7x-6)=0x1=3x2=3.49449283705542
0.3X=18X=60
设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=
1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=1/3[1/x-1/(x+3)]+[1/(x+3)-1/(x+6)]+.+[1/(x+15)-1/(x+18)
X-0.8X=180·2X=18X=18÷0.2×=90再问:看不懂再答:反正得数是90再问:过程再问: 再答: 再问:靠
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
1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=[1/x-1/(x+3)+1/(x+3)-1/(x+6)+1(x+6)-1/(x+9)]/3=[1/x-1/(x+9)]/3=3/
1、0.5x-12+x=181.5x=30x=20.2、两车速度和:270÷1.5=180,甲车速度:180÷(7+8)×8=96,乙车速度:180÷(7+8)×7=84.
X-0.8X=20.2X=2X=2/0.2X=10
x-4x=102-3x=102x=-34x-0.8x=220.2x=22x=110
0.2x=16x=80
(5+1)X=186X=18X=3
问题是不是X2=(X+30)*(X-18)啊?要是上面的话就这样X2=X*X-X*18+30*X-30*18=X2+12X-540移项得:X2-X2-12X=-540,即-12X=-540,X=45*
2x等于x+15x等于15
1.1X-0.8X=180.3X=18X=18/0.3X=60