1)7А+15А=22А=3*22=66
2)(23+16)*B=39*8=(40-1)*8=320-8=312
3)(44-18)*X=26X=26*5=130
4) Y(14+33-45)=Y2=17*2=34
5)M(52-25+45)=72*9=648
6)N(18+34-22)=30N=180