8(x+15)-20=10x 2(100-x)-15=150-x 25x-165=10(15-x) 5(x-10)=3x

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/18 13:25:00

8(x+15)-20=10x 2(100-x)-15=150-x 25x-165=10(15-x) 5(x-10)=3x-6

8(x+15)-20=10x
8x+8×15-20=10x
10x-8x=120-20
2x=100
x=100÷2
x=50
2(100-x)-15=150-x
2×100-2x-15=150-x
2x-x=200-15-150
x=35
25x-165=10(15-x)
25x-165=10×15-10x
25x+10x=150+165
35x=315
x=315÷35
x=9
5(x-10)=3x-6
5x-5×10=3x-6
5x-3x=50-6
2x=44
x=44÷2
x=22

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 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), （X+X)+(X-X)+(X*X)+(X/X)=100 x+x=x+15 X/15 + X/12 + X/10 = 1365,求X, 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 x的平方-2x+1=15 ; x(2x-5)=4x-10 ; x的平方+5x+7=3x=11 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1