2/3x=5/12 5/8除x=5/32 4/15x=20 1/2x+8/9=17/18 24-1/7x=3 2/3x-
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2/3x=5/12 5/8除x=5/32 4/15x=20 1/2x+8/9=17/18 24-1/7x=3 2/3x-3/4=7/20
3/4除()=3/4+()=2/3*()=1
3/4除()=3/4+()=2/3*()=1
2/3x=5/12
x=5/12÷2/3
x=5/12×3/2
x=5/8
5/8÷x=5/32
x=5/8÷5/32
x=5/8×32/5
x=4
4/15x=20
x=20÷4/15
x=20×15/4
x=75
1/2x+8/9=17/18
1/2x=17/18-8/9
1/2x=1/18
x=1/9
24-1/7x=3
1/7x=21
x=147
2/3x-3/4=7/20
2/3x=11/10
x=11/10÷2/3
x=33/20
x=1.65
3/4÷(3/4)=3/4+(1/4)=2/3×(3/2)=1
x=5/12÷2/3
x=5/12×3/2
x=5/8
5/8÷x=5/32
x=5/8÷5/32
x=5/8×32/5
x=4
4/15x=20
x=20÷4/15
x=20×15/4
x=75
1/2x+8/9=17/18
1/2x=17/18-8/9
1/2x=1/18
x=1/9
24-1/7x=3
1/7x=21
x=147
2/3x-3/4=7/20
2/3x=11/10
x=11/10÷2/3
x=33/20
x=1.65
3/4÷(3/4)=3/4+(1/4)=2/3×(3/2)=1
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值
(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)
解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3
1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980
1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少
(3-x)/(1-x)-(5-x)/(7-x)+(x^2-x)/(x^2-8x+7)=1