3×(a²-ab)-5×(ab+2a²-1)化简
化简:(1)3×(a²-ab)-5×(ab+2a²-1)(2)2x²-[x²-(3x²+2x-1)](3)(3a-2a&...
化简:
(1)3×(a²-ab)-5×(ab+2a²-1)
(2)2x²-[x²-(3x²+2x-1)]
(3)(3a-2a²)-[5a-1/3×(6a²-9a)-4a²]
(4)-2y²+(3xy²-x²y)-2×(xy²-y²)
(5)(a³-2a²+a-7)-3a²+1/4a-(2a²-7a) 展开
(1)3×(a²-ab)-5×(ab+2a²-1)
(2)2x²-[x²-(3x²+2x-1)]
(3)(3a-2a²)-[5a-1/3×(6a²-9a)-4a²]
(4)-2y²+(3xy²-x²y)-2×(xy²-y²)
(5)(a³-2a²+a-7)-3a²+1/4a-(2a²-7a) 展开
1个回答
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(1)3×(a²-ab)-5×(ab+2a²-1)
=3a²-3ab-5ab-10a²+5
=-7a²-8ab+5
(2)2x²-[x²-(3x²+2x-1)]
=2x²-[x²-3x²-2x+1]
=2x²-x²+3x²+2x-1
=4x²+2x-1
(3)(3a-2a²)-[5a-1/3×(6a²-9a)-4a²]
=3a-2a²-[5a-2a²+3a-4a²]
=3a-2a²-5a+2a²-3a+4a²
=4a²-5a
(4)-2y²+(3xy²-x²y)-2×(xy²-y²)
=-2y²+3xy²-x²y-2xy²+2y²
=xy²-x²y
(5)(a³-2a²+a-7)-3a²+1/4a-(2a²-7a)我要回答搜索相关资料
=a³-2a²+a-7-3a²+1/4a-2a²+7a
=a³-7a²+33a/7
=3a²-3ab-5ab-10a²+5
=-7a²-8ab+5
(2)2x²-[x²-(3x²+2x-1)]
=2x²-[x²-3x²-2x+1]
=2x²-x²+3x²+2x-1
=4x²+2x-1
(3)(3a-2a²)-[5a-1/3×(6a²-9a)-4a²]
=3a-2a²-[5a-2a²+3a-4a²]
=3a-2a²-5a+2a²-3a+4a²
=4a²-5a
(4)-2y²+(3xy²-x²y)-2×(xy²-y²)
=-2y²+3xy²-x²y-2xy²+2y²
=xy²-x²y
(5)(a³-2a²+a-7)-3a²+1/4a-(2a²-7a)我要回答搜索相关资料
=a³-2a²+a-7-3a²+1/4a-2a²+7a
=a³-7a²+33a/7
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