2/9+1/4÷2/5+3/8 2/3+(4/7-1/2)×1/12 2/3+3/4x=1/6 1/2x÷1/5=3/5
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/22 01:31:30
2/9+1/4÷2/5+3/8 2/3+(4/7-1/2)×1/12 2/3+3/4x=1/6 1/2x÷1/5=3/5 5x-3/5=16/15
2/9+1/4÷2/5+3/8
=2/9+1/4×5/2+3/8
=2/9+5/8+3/8
=2/9+(5/8+3/8)
=2/9+1
=1·2/9
=11/9
2/3+(4/7-1/2)×1/12
=2/3+(4/7-1/2)×1/12
=2/3+4/7×1/12-1/2×1/12
=2/3+1/21-1/24
=14/21+1/21-1/24
=15/21-1/24
=5/7-1/24
=120/168-7/168
=113/168
2/3+3/4x=1/6
3/4x=1/6-2/3
3/4x=1/6-4/6
3/4x=-1/2
x=-1/2×4/3
x=-2/3
1/2x÷1/5=3/5
1/2x=3/5×5
1/2x=3
x=3×2
x=6
5x-3/5=16/15
5x=16/15+3/5
5x=16/15+9/15
5x=25/15
5x=5/3
x=5/3×1/5
x=1/3
=2/9+1/4×5/2+3/8
=2/9+5/8+3/8
=2/9+(5/8+3/8)
=2/9+1
=1·2/9
=11/9
2/3+(4/7-1/2)×1/12
=2/3+(4/7-1/2)×1/12
=2/3+4/7×1/12-1/2×1/12
=2/3+1/21-1/24
=14/21+1/21-1/24
=15/21-1/24
=5/7-1/24
=120/168-7/168
=113/168
2/3+3/4x=1/6
3/4x=1/6-2/3
3/4x=1/6-4/6
3/4x=-1/2
x=-1/2×4/3
x=-2/3
1/2x÷1/5=3/5
1/2x=3/5×5
1/2x=3
x=3×2
x=6
5x-3/5=16/15
5x=16/15+3/5
5x=16/15+9/15
5x=25/15
5x=5/3
x=5/3×1/5
x=1/3
|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
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
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
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),
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
1x+2x+3x+4x+5x+6x+7x…+99x=100