6+[0.5×0.8+(2.6-y)×9]÷4=22 解方程

y (3y^2+8y-3)-6y(3y+2y-1)+9y 通分 y+3/y*y-6y+9,1/2y+6,y-1/y*y-9 (y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值. (x+y)+(2x+0.5y)+(3x+1/6y)+...+(9x+1/72y),当x=2,y=9时,求代数式的值 解方程:6+【0.5×0.8+(2.6-y)×9】÷4=22要过程 6+[0.5×0.8+(2.6-y)×9]÷4=22 解方程 (x-y)³+9(x-y)-6(x-y)² y-6y'+9y=0求解 谁会? 90+0.5y+30=6y 微积分求通解y’’-6y’+9y=e^xcosx y’’-6y’+9y=e^xsinx 1+6y+9y^2 因式分解 6y^2+9y+2 (x+y)²+6(x+y)+9 (x+y)^2+6(x+y)+9 |2y-6|=9+4y 1.已知多项式¾x³y四次方-½x²y+y²-四分之五x³y的四次方加0.5x²y加½x³y的四次方-2y+3请说明它的值与字母x无关2.已知代数式9-6y-4y²=7 求2y²+3y+7的值由9-6y-4y²= 计算：[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1) maths(right,very esay①（1-y)/2=2-[(2y-1)/3]②21%x-5%=5%x+0.11③(2y-1)/3-(10y+1)/6=(2y+1)/4-1④1/3[3y-(10-7y)/2)]-1/2[2y-9(2y+2)/3）]=y/2-1⑤(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=（y-5）/2