Đáp án:
Giải thích các bước giải:
$3.(2x+3).(3x-5)=3(6x^2-x-15)=18x^2-3x-45$
3.(2x+3).(3x-5) = 3.(2x.3x-x-3.5)=3.(6x^2-x-15) = 18x^2-3.x-45
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