Помогите, алгебра...

Question

Помогите, алгебра...

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Answer 1

1) (7x-8y)^2= (7x)^2 - 2*7x*8y+(8y)^2=49x^2-112xy+64y^2



2) (14m + 17n^3)^2= (14m)^2 + 2*14m*17n^3 + (17n^3)^2=196m^2 + 476mn^3+ 289n^6


3)49-16/25a^4= (7-4/5a^2)(7+4/5a^2)


4) 38^2-16^2= (38-16)(38+16)=22*54=

Comments

1188

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5) a^3 - 8b^6 = (a-2b^2)(a^2 + 4ab^2+4b^4)

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6) (2x + 3y)^3= (2x)^3 + 3*(2x)^2*3y + 3*2x*(3y)^2 + (3y)^3=8x^3 + 36x^2y + 54xy^2 + 27y^3

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7) (x-6)^2= x^2 - 2*x*6+ 6^2 = x^2 - 12x + 36

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спасибо

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нез