1) 1/2+3/8*7-8/3
2) 2(3/4-3/4+3/4-3/4)

1) 1/2+3/8*7-8/3==1/2+21/8-8/3==4/8+21/8-8/3==25/8-8/3==75/24-64/24=11/242) 2(3/4-3/4+3/4-3/4)=2*0=0