999x1001+1【化简】2a^2.a^3+4a。a^4麻烦详细
(-xy^2)^4.x÷(xy^2)^3 (x-y)(x+y)+(x+y)^2-2x^2
999x1001+1
=999x(1+1000)+1
=999+999000+1
=999+1+999000
=1000+999000
=1000000
(1000-1)(1000+1)+1=1000^2-1+1=1000^2=1000000
(x-y)(x+y)+(x+y)^2-2x^2=x^2-y^2+x^2+2xy+y^2-2x^2=2xy
中间两个没看懂
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