u+2u分之u-2u减去(u-2u)(u+2u)分之2

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u+2u分之u-2u减去(u-2u)(u+2u)分之2u+2u分之u-2u减去(u-2u)(u+2u)分之2u+2u分之u-2u减去(u-2u)(u+2u)分之2–3-2/3u∧2

u+2u分之u-2u减去(u-2u)(u+2u)分之2
u+2u分之u-2u减去(u-2u)(u+2u)分之2

u+2u分之u-2u减去(u-2u)(u+2u)分之2
–3-2/3u∧2