А3 – в
7к-2р=-4*7/7-2/2=-4-1=-5
А4 – б
0.5х+3lt;5.5
0.5хlt;2.5
хlt;2.5*2
хlt;5
В1 – 12
1.44*100/12=144/12=12
В2 –
0.6(х-14)-0.4(5х-1)=0.6х-8.4-2х+0.4=-1.4х-8
-1.4*25/6-8=-35/6-8=-5 5/6-8=-13 5/6
В3 –
11х+103=1+(12х-31)
11х+103=1+12х-31
12х-11х=103-1+31
х=133