【紧急】化简:(1) 3(2x²-y²)-2(3y²-2x²) (2) 3a²-[7a-2(4a-1)-2a²]
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【紧急】化简:(1) 3(2x²-y²)-2(3y²-2x²) (2) 3a²-[7a-2(4a-1)-2a²]
【紧急】
化简:
(1) 3(2x²-y²)-2(3y²-2x²)
(2) 3a²-[7a-2(4a-1)-2a²]
【紧急】化简:(1) 3(2x²-y²)-2(3y²-2x²) (2) 3a²-[7a-2(4a-1)-2a²]
原式=6x²-3y²-6y²+4x²
=10x²-9y²
原式=3a²-(7a-8a+2-2a²)
=3a²-(-a+2-2a²)
=3a²+a-2+2a²
=5a²+a-2
解
原式
=6x²-3y²-6y²+4x²
=(6x²+4x²)+(-3y²-6y²)
=10x²-9y²
原式
=3a²-7a+2(4a-1)+2a²
=(3a²+2a²)+(8a-7a)-2
=5a²+a-2
10x²-9y²
5a²+a-2
1.6 x²-3 y²-6y²+4 x²=10 x²-9 y²