2) 9(2b+3)+5(2-b) = 18b+27+10-5b=13b+37
при b=1;
13*1+37=13+37=50
при b=3.
13*3+37=39+37=76
3) 7(5с+2)+3(1-c)=35c+14+3-3c=32c+17
c=5
32*5+17=160+17=177
c=0
32*0+17=0+17=17
4) 8(5+3d)+4(3-2d)=40+24d+12-8d=16d+52
при d=3;
16*3+52=48+52=100
d=4
16*4+52=64+52=116