[题目]一,填空-|||-1 (x)^2*3xy=-|||-2 (a)^2btimes (-2ab)=-|||-3 -3(x)^2*(2xy+(y)^2-2)=-|||-4 (1/3(a)^2-3ab)times 3/4a(b)^2=-|||-5 (m+n)times (m-2n)=-|||-6 (3x+1)times (2x-3)=-|||-7 若 (x+a)times (x-2) 的乘积中不含X的一次项,则 a=-|||-8不论X取何值,等式 (3x-8)times (x+2)-((x)^2-25)=2-|||-^2-2x+(m)^2 总能成立,则 m=-|||-9 已知 +b=m, times b=-4, 化简 (a-2)times (b-2) 的结-|||-果是-|||-二选择-|||-1下列计算错的是 ()-|||-a. (a-3b)times (-6a)=-6(a)^2-18ab-|||-b.(-1/3(x)^2y)times (-9xy+1)=3(x)^3(y)^2+1-|||-c.((-1/2{a)^2b)}^2*(-4a(b)^2)=(a)^5times (b)^4-|||-d. (2/3a(b)^2-2ab)times (-1/2ab)=-1/3(a)^2(b)^3+(a)^2(b)^3-|||-2下列运算正确的是-|||-a.^6div (a)^3=(a)^2-|||-b.((-1))^-1+1=0-|||-c.2a+3b=5ab-|||-d.(-a+b)times (-a-b)=(b)^2-(a)^2-|||-三 计算-|||-1 (-2|3(a)^2(b)^3c)times ((1/2ab))^2-|||-2 (-1/2(m)^2n-1/3mn+1)times (-1/4(m)^3n)-|||-3 (x+2)times (x+3)-(x+6)times (x-1)-|||-1.已知 x=1/2, 求 (y+(y)^2)-(y)^2(xy-x)+2x(x-(y)^2) 的值-|||-2.已知 (b)^2=7 求 ((a)^2(b)^5-a(b)^3-b) 的值-|||-3.请你说明对于人和自然数n,代数式 times (n+5)-(n--|||-)times (n+2) 的值都能被6整除-|||-4.在长为 +2, 宽为 +3 的长方形铁片上,挖去长-|||-为 b+1 宽为 |acdot 1| 的小长方形铁片,求剩余部分的面-|||-积