Ответы на вопрос:
2.7*6.2-9.3*1.2+6.2*9.3-1.2*2.7 =(2.7*6.2-1.2*2.7)+(6.2*9.3-9.3*1.2)=
2.7(6.2-1.2)+9.3(6.2-1.2)=2.7*5+9.3*5=5*(2.7+9.3)=5*12=60
аналогично 125*48-31*82-31*43+125*83 =125(48+83)-31(82+43)=125*131-31*125=125(131-31)=125*100=12500
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