1)7 1/3-6 7/8=7 8/24-6 21/24=6 32/24-6 21/24=11/24
2)5 1/4-4 21/40=5 10/40-4 21/40=4 50/40-4 21/40=29/40
3)11/24:3/4=11/24*4/3=11/18
4)29/40:1 9/20=29/40*20/29=1/2
5)20+11/18=20 11/18
6)20 11/18-1/2=20 11/18-9/18=20 2/18=20 1/9
-5²+(-2)⁴
-5² = - 25
(-2)⁴ = - 16
-25 - ( -16) = - 25+16= -9