Ответ:
1) 5(х-у)²=5(2,5-4,5)²=5(-2)²=5*4=20
2) 3(x+y)²=3(2,5+4,5)²=5*7²=3*49=147
3) (5x-y)²=(5*2,5-4,5)²=8²=64
4) (3x+y)²=(3*2,5+4,5)²=12²=144
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Ответ:
1) 5(х-у)²=5(2,5-4,5)²=5(-2)²=5*4=20
2) 3(x+y)²=3(2,5+4,5)²=5*7²=3*49=147
3) (5x-y)²=(5*2,5-4,5)²=8²=64
4) (3x+y)²=(3*2,5+4,5)²=12²=144