1)7a+15a при a=3.....7*3+15*3=21+45=56
2)23b+16b при =8.....23*8+16*8=184+128=312
3)44x-18x при x=5.....44*5-18*5=220-90=130
4)14y+33y-45y при y=17.....14*17+33*17-45*17=238+561-765=34
5)52m-25m+45m при m=9.....52*9-25*9+45*9=468-225+405=648
6)18n+34n-22n при n=6.....18*6+34*6-22*6=108+204-132=180.