а) -0,28* 4/7+5/7: 2 6/7=8/100+1/4=8/100+25/100=33/100
б)(-2/3)^2*2 1/4 *(-3)=4/9*2 1/4*(-3)=1*(-3)=-3
а) -0,28* 4/7+5/7: 2 6/7=8/100+1/4=8/100+25/100=33/100
б)(-2/3)^2*2 1/4 *(-3)=4/9*2 1/4*(-3)=1*(-3)=-3