Вычислите:

а)3,2*4,3-2,2*4,3-5,2*5,3+4,2*5,3(ответ -1)

б)0,68*2-0,68*15+0,12*2-0,68*5 (ответ -12)

в) 8,8*0,75-1,2*0,45+1,2*0,75-8,8*0,45 (ответ 3)

Нужны логические решения!!!

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