2x+30+x怎么算

2x+30+x怎么算 30x+20x-x^2=50x-x^2 怎么算 (25/X)X(30/X)= 15/X怎么算 x^2-x-60怎么算x^2-x-6 (x+2)(x+3)-(x+6)(x-1) 怎么算? x^2=(x+30)X(x-18)怎么解 (x^2-3x+1)^3怎么算出x^6-9x^5+30x^4-45x^3+30x^2-9x+1 (x-3)/(x^2+3x+2)×(x^2)/(x^2-4x+3)怎么算？ (x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x)怎么算? X*(22/2-X)=30 怎么算 数学方程2x+30%x=4.6怎么算? (10+2x)(30-x)=600这怎么算 2X+30=3X-4怎么算 X+30%X=52 怎么算 X+1.5X=30怎么算? x-30%x=4.9怎么算? (x+2)(4x-2)怎么算, 2^x=x^2怎么算