求解答题答案,谢谢
3个回答
2016-04-10
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原式=(2x-1)(3x+2)(2x-1+3x+2+x)=(2x-1)(3x+2)(6x+1)
代入x=1得
1x5x7=35
原式=x(m-2)(5-4)=x(m-2)
代入x=0.4,m=5.5得
0.4x3.5=1.4
代入x=1得
1x5x7=35
原式=x(m-2)(5-4)=x(m-2)
代入x=0.4,m=5.5得
0.4x3.5=1.4
展开全部
(1)
(2x-1)²(3x+2) + (2x-1)(3x+2)² - x(1-2x)(3x+2)
=(2x-1)(3x+2)[(2x-1) + (3x+2) + x]
=(2x-1)(3x+2)(6x+1)
=2*5*7=70
(2)
5x(m-2) - 4x(m-2)
= x(m-2)
=0.4 * 3.5
= 1.4
(2x-1)²(3x+2) + (2x-1)(3x+2)² - x(1-2x)(3x+2)
=(2x-1)(3x+2)[(2x-1) + (3x+2) + x]
=(2x-1)(3x+2)(6x+1)
=2*5*7=70
(2)
5x(m-2) - 4x(m-2)
= x(m-2)
=0.4 * 3.5
= 1.4
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2016-04-10
展开全部
(2x-1)²(3x+2)+(2x-1)(3x+2)²-x(2x-1)(3x+2)
=(2x-1)(3x+2)[(2x-1)+(3x+2)-x]
=(2x-1)(3x+2)(4x+1)
其中x=1,则:
原式=(2x1-1)(3x1+2)(4x1+1)
=1x5x5
=25
5x(m-2)-4x(m-2)
=(m-2)(5x-4x)
=x(m-2)
其中x=0.4 m=5.5,则:
原式=0.4x(5.5-2)
=0.4x3.5
=1.4
=(2x-1)(3x+2)[(2x-1)+(3x+2)-x]
=(2x-1)(3x+2)(4x+1)
其中x=1,则:
原式=(2x1-1)(3x1+2)(4x1+1)
=1x5x5
=25
5x(m-2)-4x(m-2)
=(m-2)(5x-4x)
=x(m-2)
其中x=0.4 m=5.5,则:
原式=0.4x(5.5-2)
=0.4x3.5
=1.4
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