5x^2-(3x^2+5x^2)+(4y^2+7xy),其中x=-1 y=1-根号2先化简,再求值
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5x^2-(3x^2+5x^2)+(4y^2+7xy),其中x=-1 y=1-根号2先化简,再求值
5x^2-(3x^2+5x^2)+(4y^2+7xy),其中x=-1 y=1-根号2
先化简,再求值
5x^2-(3x^2+5x^2)+(4y^2+7xy),其中x=-1 y=1-根号2先化简,再求值
原式=
5x^2 - 3x^2 - 5x^2 + 4y^2 + 7xy
= -3x^2 + 7xy + 4y^2
= (x + y) (3x + 4y) - 6x^2
= (-根号2) * (1-4*根号2) - 6
= -根号2 + 8 - 6
= 2-根号2
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*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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