1.а)4b+2y-12b-y  b)40+6(a-7)
 c)2p+(3p-4)-(4p-7)
 d)3(c-1)-2(3c-5)
2.5/6(12c+a)+2/3(3c-2a)
3.Вынести за скобки
a)8c-16a+20
b)10ax-2ay+10ac
c)7,5а-3,9х+4,2с
4.2(a-b)-4(a+b) при а=3  и b=-2,1
5Подставте вместо A B C =A+B-C
A=y+3х,В=5х-1,С=4н-5
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