#1.
▪[(z^3 × z^17)÷z^17] × [(a^43 × a^2)÷a^44] = [z^20 ÷ z^17] × [a^45 ÷ a^44] = z^3 × a = az^3
▪(m-n)^42 ÷ (m-n)^12 × (m-n)^29 = (m-n)^30 × (m-n)^29 = (m-n)^59
#2.
▪((-8)^0)^5) - 6^2 × 6 - 5^2 × 0,2 = 1 - 6^3 - 25 × 0,2 = 1 - 216 - 5 = 1 - 221 = -220
▪0,75 - (12^0)^3 - (1,5)^2 + 4^3 × 0,1 = 0,75 - 12^0 - 2,25 + 64 × 0,1 = 0,75 - 1 - 2,25 + 6,4 = 3,9