(8х²-ху-3у²)-(-7х²+ху-3у²)= 8х²-ху-3у²+7х²-ху+3у²=15х²-2ху
8х²-ху-3у² - (-7х²+ху-3у² ) = 8х²-ху-3у² +7х²-ху+3у² = 15х²-2ху
(8х²-ху-3у²)-(-7х²+ху-3у²)= 8х²-ху-3у²+7х²-ху+3у²=15х²-2ху
8х²-ху-3у² - (-7х²+ху-3у² ) = 8х²-ху-3у² +7х²-ху+3у² = 15х²-2ху