Toán Lớp 8: Thực hiện phép nhân:(5x+3) (7x-5)
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Toán Lớp 8: Thực hiện phép nhân:(5x+3) (7x-5)
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$=5x.(7x-5)+3.(7x-5)$
$=$ $35x^{2}$ $-$ $25x+3.(7x-5)$
$=$ $35x^{2}$ $-$ $4x-15$