计算(1)(-2x4y3z)2·8x4y2÷(-15x2y2) (2)(x+3y-2)(x-3y-2)(3)(x+4)2-(x+2)(x-5) (4)(3ab+4)2-(3ab-4)2
解:(1)(-2x4y3z)2·8x4y2÷(-15x2y2)=4x8y6z2×8x4y2÷(-15x2y2)=32x12y8z
256×9-46×9=____
____度