化简(3a^3-ab+7)-(5ab-4a^2+7) 其中a=2 b=3/1 求值 化简 6( x^-3X)-2(X-2X^2Y)-2X(-10X)其中(x+2)^2+
化简(3a^3-ab+7)-(5ab-4a^2+7)其中a=2b=3/1求值化简6(x^-3X)-2(X-2X^2Y)-2X(-10X)其中(x+2)^2+2y+3的绝对...
化简(3a^3-ab+7)-(5ab-4a^2+7) 其中a=2 b=3/1 求值 化简 6( x^-3X)-2(X-2X^2Y)-2X(-10X)其中(x+2)^2+ 2y+3的绝对值=0 求值 化简2(x^2Y+3XY^2)-[-2(X^Y-1)+XY^2],其中x=—1,y=1
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(3a³-ab+7)-(5ab-4a²+7)
=3a³-ab+7-5ab+4a²-7
=3a³+4a²-6ab
=24+16-4
=36
(x+2)²+ 2y+3的绝对值=0
所以x+2=0,2y+3=0
x=-2,y=-3/2
6( x²-3X)-2(X-2X²Y)-2X(-10X)
=6X²-18X-2X+4X²Y+20X²
=26X²-20X+4X²Y
=104+40-24
=120
2(X²Y+3XY²)-[-2(X²Y-1)+XY²]
=2X²Y+6XY²+2X²Y-2-XY²
=4X²Y+5XY²-2
=4-5-2
=-3
=3a³-ab+7-5ab+4a²-7
=3a³+4a²-6ab
=24+16-4
=36
(x+2)²+ 2y+3的绝对值=0
所以x+2=0,2y+3=0
x=-2,y=-3/2
6( x²-3X)-2(X-2X²Y)-2X(-10X)
=6X²-18X-2X+4X²Y+20X²
=26X²-20X+4X²Y
=104+40-24
=120
2(X²Y+3XY²)-[-2(X²Y-1)+XY²]
=2X²Y+6XY²+2X²Y-2-XY²
=4X²Y+5XY²-2
=4-5-2
=-3
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