Question

помагите пжжжжжжжжж ​

Answer 1

1) 21-(5-8)=21-(-3)=21+3=24
3) 1/6-(5/12-7/12)=1/6-(-2/12)=1/6+2/12=4/12=1/3
5) -4,5-(7-9,5)=-4,5-(-2,5)=-4,5+2,5=-2
7) -18-(9-5)=-18-(-4)=-18+4=-14
9) -2/9-(1-8/9)=-2/9-(1/9)=-2/9+(-1/9)=-3/9=-1/3