若能将3X^2-4X 7
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1/3x=1/4*1/5,x=3/201/2x=3/7*()你数字没给,自己算.
4x-6x7.2=9.84x-43.2=9.84x=9.8+43.24x=53x=53÷4x=13.25
f(x)=x7-2x6+3x3-4x2+1=((((((x-2)x+0)x+0)x+3)x-4)x+0)x+1故v4=(((x-2)x+0)x+0)x+3当x=2时,v4=(((2-2)2+0)2+0
1/(1x4)+1/(4x7)+1/(7x10)+...+1/(3n-2)x(3n+1)]=1/3*(1-1/4+1/4-1/7+.+1/(3n-2)-1/(3n+1))=1/3*(1-1/(3n+1
100x(3/1x4+3/4x7+3/7x10+.3/97x100)=100x[(1-1/4)+(1/4-1/7)+(1/7-1/10)+……+(1/97-1/100)]=100x[(1+1/4+1/
f(3)=((((((7*3+6)*3+5)*3+4)*3+3)*3+2)*3+1)*3
-10.5x(-6分之1-4分之1)x7分之3除以(-0.5)=10.5x(6分之1+4分之1)x7分之3×(-2)=10.5x12分之5x7分之3×(-2)=10.5x7分之3x12分之5×(-2)
原式=1/3(1-1/4+1/4-1/7+……+1/3n-2-1/3n+1)=1/3(1-1/3n+1)=1/3(3n/3n+1)=n/3n+1
1x4分之一加4x7分之一加到(3n-2)x(3n+1)分之一=1/1x4+1/4x7+.+1/(3n-2)(3n+1)=1/3[1-1/4+1/4-1/7+...+1/(3n-2)-1/(3n+1)
53/582再问:怎么算的啊?再答:x7=85/6x1+x2.....+x10=971/685/6/971/6=53/582
10x^9+9x^8+8x7+7x^6+6x^5+5x^4+4x^3+3x^2+2x^1+1,当x=-1时的值为10x^9+9x^8+8x7+7x^6+6x^5+5x^4+4x^3+3x^2+2x^1
7^4-3x7^2-8x7^3=7^2x(7^2-3-8x7)=7^2x(49-3-56)=49x(-10)=-490(x+y)^2-2(x^2-y^2)+(x-y)^2=(x+y)^2-2(x+y)
3/8=15/40(3/5)/(3/7)=(4/5)/(4/7)
0.9x-4X1.3=1.10.9x-5.2=1.10.9x=1.1+5.20.9x=6.3x=71.3X7=25.1-8x9.1=25.1-8x8x=25.1-9.18x=16x=24.8+0.5x
解方程:4(3x7)=-19-35x12X+28=-19-35X,37X=-37,X=-1把X=1代入方程:2分之3m+5x=-m-7x3/2m+5=-m-75/2m=-12m=-24/5.
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4分之1x+4x7=241/4x=24-281/4x=-4x=-16如果本题有什么不明白可以追问,
0.9x--4x1.3=1.10.9x-5.2=1.10.9x=6.3x=71.3x7=25.1-8x9.1=25.1-8x8x=16x=24.8+0.5x=6.30.5x=1.5x=3(25+2x)
48-X+3x7=3648-x+21=36-x=36-48-21-x=-33x=33