(x+y)^5+2(-x—y)^3·(x+y)²;(-12)²×10^-6÷(2×10^5);
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(x+y)^5+2(-x—y)^3·(x+y)²;(-12)²×10^-6÷(2×10^5);(x+y)^5+2(-x—y)^3·(x+y)²;(-12)²×1
(x+y)^5+2(-x—y)^3·(x+y)²;(-12)²×10^-6÷(2×10^5);
(x+y)^5+2(-x—y)^3·(x+y)²;
(-12)²×10^-6÷(2×10^5);
(x+y)^5+2(-x—y)^3·(x+y)²;(-12)²×10^-6÷(2×10^5);
(x+y)^5+2(-x—y)^3·(x+y)²;
= (x+y)^5+2(-(x+y)^5
=(x+y)^5(1-2)
=-(x+y)^5
(-12)²×10^-6÷(2×10^5);
=(-2^2*3)²×10^-6÷(2×10^5)
=9*2*10(^-6)-6*2×10^(-5)
=2×10^(-5)*(9*2*10^(-1)-6)
=2×10^(-5)*(-21/5)
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