
计算:(1)a(a+2) 2 (2)(2x+y)(2x-y)+(-x)(4x-y)(3)4(x+y) 2 -9(x-y) 2 (4)(-3x 2
计算:(1)a(a+2)2(2)(2x+y)(2x-y)+(-x)(4x-y)(3)4(x+y)2-9(x-y)2(4)(-3x2y3)2-(-2x3y2)3÷(-2x5...
计算:(1)a(a+2) 2 (2)(2x+y)(2x-y)+(-x)(4x-y)(3)4(x+y) 2 -9(x-y) 2 (4)(-3x 2 y 3 ) 2 -(-2x 3 y 2 ) 3 ÷(-2x 5 y 5 ) 2 .
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(1)a(a+2) 2 =a(a 2 +4a+4) =a 3 +4a 2 +4a; (2)(2x+y)(2x-y)+(-x)(4x-y) =4x 2 -y 2 -4x 2 +xy =-y 2 +xy; (3)4(x+y) 2 -9(x-y) 2 =4(x 2 +2xy+y 2 )-9(x 2 -2xy+y 2 ) =4x 2 +8xy+4y 2 -9x 2 +18xy-9y 2 =-5x 2 +26xy-5y 2 ; (4)(-3x 2 y 3 ) 2 ?(-2x 3 y 2 ) 3 ÷(-2x 5 y 5 ) 2 =(9x 4 y 6 )?(-8x 9 y 6 )÷(4x 10 y 10 ) =(-72x 13 y 12 )÷(4x 10 y 10 ) =-18x 3 y 2 . |
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