- 计算或解方程或化简求值:(1)(x﹣8y)(x﹣y)(2)(25x2+15x3y﹣20x4)÷(﹣5x2)(3)(4)(2x+3y)2﹣(2x+y)(2x﹣...
- 利用乘法公式计算:(1) (2) (3)
- 计算:(1)(2)(3)(4)(5)(6)
- 计算: (1)ymym+1(2)(﹣2xy3z2)4(3)(﹣3×103)2(4)5x(2x2﹣3x+4)(5)(2a﹣b)2(4a2+b2)2(2a+b)2(6)[(x...
- 计算:(1)﹣(x3)2·(x2)3;(2)(x+2)2﹣(x﹣1)(x+1).
- 计算:(1)(x3x5)×x2(2)(﹣2x4)3+3x4(﹣x)8(3)6x(x﹣3y2)(4)(2x﹣3)(4﹣x)(5)
- (1)(2ab+3b2﹣5)﹣(3ab+3b2﹣8)(2)x2×x3+x7×x2(3)107÷(103÷102)(4)(x﹣y)3×(x﹣y)2×(y﹣x)
- 计算下列各题:(1)3(a﹣2b)﹣2(a﹣b);(2)(xy+4)(xy﹣4);(3)a2bc3·(﹣2a2b2c)2;(4)(54x2y﹣108xy2﹣36x...
- 化简与计算(1)计算(2)化简(3).
- 计算:(1).(2).(3).(4)[(x+2y)2﹣(x+y)(3x﹣y)﹣5y2]÷2x.(5)(2x﹣y+1)(2x+y﹣1).(6)(x﹣y)2(x...
- 计算(1)(6a2﹣8a+11b3)﹣(11a2+2b3)(2)(3x+9)(6x+8)(3)(4a3b﹣6a2b2+12ab3)÷2ab(4)(x+2)2﹣(x+1)(x﹣1)
- 计算:①(2x2y+2x+4)﹣2(x2y+2)②(x﹣y+1)(x+y+1)③(x﹣y)2(x2+y2)2(x+y)2④[(ab+3)(ab﹣3)﹣7a2b2+9]÷(﹣2ab)
- 化简或求值:(1)2a5·(﹣a)2﹣(﹣a2)3·(﹣7a);(2)(4x2y+5xy﹣7x)﹣(5x2y+4xy+x);(3)(x2y﹣2xy+y2)·3xy;...
- (1)(﹣x﹣y)(x﹣y)+(x+y)2;(2)(2a6x3﹣9ax6)÷(3ax3);(3)(2x﹣5)(2x+5)﹣(2x+1)(2x﹣3);(4);(...
- (1)﹣2x2y(3x2﹣2x﹣3)(2)(2x﹣3y)2﹣(y+3x)(3x﹣y)(3)(a+b)(a﹣b)+(a+b)2﹣a(2a+b),其中a=,b=﹣1.