Упростить выражение (раскрыть скобки).
1) (3х+у) –2 (5х – у) = 3х+у – 10х+2у = –7х+3у;
2) 3х(а+1,5) –4ах = 3ах+4,5х – 4ах = 4,5х – ах;
3) –6 (х + у)+3 (2х – у) = – 6х – 6у + 6х – 3у = –9у.
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