Tính: P = 3x^3 - ( 3x - 2 ) x^2 - 2x ( x + 1 )
2 câu trả lời
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P=3x3-(3x-2)x2-2x(x+1)
=3x3-(3x3-2x2)-(2x2+2x)
=3x3-3x3+2x2-2x2-2x
=(3x3-3x3)+(2x2-2x2)-2x
=0+0-2x
=2x
Đáp án:
P=3x3-(3x-2).x2-2x.(x+1)
P=3x3-(3x3-2x2)-(2x2+2x)
P=3x3-3x3+2x2-2x2-2x
P=(3x3-3x3)+(2x2-2x2)-2x
P=0+0-2x
P=-2x
#dariana