раскройте скобки и упростите выражения
1)(а+2,4)-(6,4+а)
2)(2х+3,2)-(4х-5)
3)14х-7(2х-4)
4)(4,2+m)-(m-4,2)
5)(2,3-b)-(6,8-b)
СРОЧНО ПОЖАЛУЙСТА!!!!​
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