Помогите пожалуйста сравнить 1.(a+b)*5   a*5+b*4
2.(c*2)*(a*5)    a*c*10
3.(t+56)-6    t+40
4.(a-b)*4   a*4-b*4
5.d+12+f+8      21+d+f
6.119-(19+t)   110-t
Зарание Спасибо!!!!
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