(X-258)-(1980-X+258)=24
(x-22)+(x-24)+(x-27)+(x-20)=x
(X+X)+(X-X)+(X*X)+(X/X)=100
x+(x+24)+(x+4)/2=7x
3x-x=24
x+24=4.5X
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
30X-2X=84 5.8X-X=60 6.6X-5X=8 4X-X=24 1.5X-X=1
24x+9.6x=84 14.3x-7.6x=33.5 7x+8x-10x=70
x+x=x+15
解方程x(x-1)(x-2)(x-3)(x-4)=24
(x-22)+(x-24)+(x-27)+(x-20)=x怎么解