Jawabanmu

2014-09-04T20:47:43+07:00
10x² - 2xy + 2y² - 6x² -3xy + 9y²
= 4x² + 11y² - 5xy
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2014-09-04T21:01:05+07:00
2(5x²-xy+y²)-3(2x²+xy-3y²)=
2.5x² - 2.xy + 2.y² - 3.2x²- 3.xy+ 3.3y²=
10x²-2xy+2y²-6x²-3xy+9y²=
10x²-6x²-2xy-3xy+2y²+9y²=
4x²+5xy+11y²
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