=((1,4х-3,5х)*2+3,4х-х)*3=(-2,1х*2+3,4х-х)*3=(-4,2х+3,4х-х)*3=-1,8х*3=-5,4х
-0.4a(-4b+3p-1.1c)=-0,4а*4в -3p+1/1c
-20:(13+6*(-3))=-20:(13-18)=-20:(-5)=4
27/100-4/3:8/9=27/100-4/3*9/8=27/100-36/24=27/100-6/4=27/100-150/100=-123/100=-1,23
4) 3,8у+4,22у-у=7,02у
5) 60*25:100=15
6) -4(3х-2)+2(4-3х)=-12х+8+8-6х=-18х+16
40*5:8=25 станиц прочитал ученик
9) 7х+6*(3-4х)=9-8х
7х+18-24х=9-8х
7х+8х-24х=9-18
-9х=-9
х=1