X*18% (1000-x)*23% =1000%20%
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(x^2-x)^2-18(x^2-x)+72=[(x^2-x)-8][(x^2-x)-9]=(x^2-x-8)(x^2-x-9)
(1)0.25x=-5x=-20(2)3x-4x=1-5x=4(3)3x-4x=18-5x=-13(4)1+7=x+7xx=1(5)9x-7x-3x=-8x=8(6)-x+3x=3-2x=1/2(7)
原式:X^2-5X+6+18=X^2+10X+9-5X+24=10X+915X=15X=1
(x^2-6x+9)÷x^2-9x+18/x+3=(x-3)^2÷(x+3)(x-3)+18/(x+3)=(x-3)/(x+3)+18/(x+3)=(x+15)/(x+3)
(X-X*20%-18)-(X-X*20%-18)*10%=X*1/2-3则(X*80%-18)*90%=X*1/2-372%*X-16.2=X*1/2-322%*X=13.2X=60
(x^2-x)^2-18(x^2-x)+72=(x^2-x-6)(x^2-x-12)=(x-3)(x+2)(x-4)(x+3)
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)[
可以拆项:X^3-7X^2+12X+6X-24=0X(X^2-7X+12)+6(X-4)=0X(X-3)(X-4)+6(X-4)=0(X-4)(X^2-3X+6)=0如果需哟啊进一步化简,需要拆分后面
10(x+2)+x-18=10x+x+2x11x+2=13x2x=2x=1
移项得2x+3x-4x=18合并同类项得X=18
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=
2X+3X+4X=18(2+3+4)x=189x=18x=2
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/
原式=½√(8x³)-3x√(2/x)+6x√(x/18)=½√[(2x)²×2x]-3x√(2x/x²)+6x√(2x/6²)=½
x^3+3x^2-6x-18=x^2(x+3)-6(x+3)=(x^2-6)(x+3)
4x+2=2x+182x=16x=8
2/x+18/x=18/(x-1/2)解1/x+9/x=9/(x-1/2)通分x-1/2+9(x-1/2)=9xx-1/2+9x-9/2=9xx=9/2+1/2x=10/2x=5
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*
等于(x-1)(x-2)(x-3)(x-4)...(x-50)的导数
4x^18-2x^12*x^6=4x^18-2x^18=2x^18