计算:(-1+a)(-1-a)(1+b2)
计算:x(x+5)-(x-3)(x+3)
计算:(-y2+x)(x+y2)
计算:(5ab-3x)(-3x-5ab)
下列算式能连续两次用平方差公式计算的是( )
A.(x-y)(x2+y2)(x-y) B.(x+1)(x2-1)(x+1)
C.(x+y)(x2-y2)(x-y) D.(x+y)(x2+y2)(x-y)
下列计算正确的是( )
A.(a-b)2=a2-b2 B.(a-b)(b-a)=a2-b2
C.(a+b)(-a-b)=a2-b2 D.(-a-b)(-a+b)=a2-b2