1.4x^4-4^3+x^2 2.ab+a+b+1

1.(x-2)(x+2)-(x+1)(x-3)2.(ab+1)^2-(ab-1)^23.(2x-y)^2-4(x-y)(x+2y) (1)（-ab+2)(5ab-3)-ab(1-ab) (2)(-2x)·(x^2-5x+6)-4x(2x^2-3x+1) 1.4x-2(x-3)-3[x-3(4-2x)+8]2.8ab-{4a-3[6ab+5(ab+a-b)-7a]-2} 1.(2x+y+1)(2x+y-1)2.(x-2)(x+2)-(x+1)(x-3)3.(ab+1)平方-（ab-1)平方4.（2x-y)平方-4（x-y)(x+2y) 1.4x^4-4^3+x^2 2.ab+a+b+1 （2)(x-2)(x+2)-(x+1)(x-3)(3) (ab+1)²-(ab-1)²(4)（2x-y)²－4(x-y)(x+2y) 2(x^2-3ab)+x(4a-3b) 3x²+2x²=（）x² 3ab²-4ab²=（）ab² 1.3（a²-2ab）-（-ab+b²） 2.-2（2x²-x+4）+3（x²-2x+3） 分式约分a-b/a^2+ab乘a^2b^2-a^4/ab-a^2.x^2-3x/x^2-6x+9乘x^2-11x+30/x^2-5x16-x^2/x^2-2x-3÷x^2-5x+4/x-3 分式约分a-b/a^2+ab乘a^2b^2-a^4/ab-a^2.x^2-3x/x^2-6x+9乘x^2-11x+30/x^2-5.16-x^2/x^2-2x-3÷x^2-5x+4/x-3 计算5ab^3*(-3/4a^3b^2)*(-2/3ab^4c)^3 x(x-1)(x+3)-x^2(x+1)+3x-1 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || (x+2)(x-2)-4y(x-y)3ab(x^2+1)+x(a^2+b^2) 因式分解 已知分式方程3x-4/(x-1)(x-2)=A/x-1+B/x-2,求整式AB. 已知【x+a】【x的平方+2x+b】=x的3次方-4x,求ab的值 计算题：① ＜(x-1／x+1)-(x+1／x-1)＞÷x+3/x*x+4x+4)② (a*a-2ab+b*b)/(a*a+ab)*(a+b)/(ab-b*b)③ (2x/x*x-1)-1/(x-1)④ -a-6约分：① 1/2*x*x*y ,1/3*x*y*y② 1/(2x+2) ,3/(x*x-1)化简：① (3+x)/(2+x)+(x*x-4) 1.4a²-2（ab-3a²）+3 2.3x²-【7x-（4x+2）+2x²】-x²谢谢.拜托