Proszę o pomoc .Pilne !!!!!
a) 2a+2b+2c+d
2(a+b+c)+d
b) 4a+4b+2c
4(a+b)+2c
2(2a+2b+c)
c) 4a+4b+4c
4(a+b+c)
2(2a+2b+2c)
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a) 2a+2b+2c+d
2(a+b+c)+d
b) 4a+4b+2c
4(a+b)+2c
2(2a+2b+c)
c) 4a+4b+4c
4(a+b+c)
2(2a+2b+2c)