Упростите выражения какие сможете напишите номер и решите пжл.

1)2а+3ab-5b+a_b+ab-4a+2ab-3b

2)a+2ab+3b-3a-4ab+b+2a-3ab+4b

3)12.5m+n-(8m-5n)-(10m+(5.5m-6g))

4)0.6xy+(2x+y-(3xy-(x+2.4xy-y)))

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