[tex]a).7*7^2^3:7^2^4=7^1^+^2^3:7^2^4=7^2^4:7^2^4=1 \\ b).11^5^0-11*11^4^9=11^5^0-11^1^+^4^9=11^5^0-11^5^0=0 \\ c).2^1^7*2^1^8-2^3^4*2=2^1^7^+^1^8-2^3^4^+^1=2^3^5-2^3^5=0 \\ d).(29-2*7)^2*15^2^0-15^2^2=(29-14)^2*15^2^0-15^2^2= \\ =15^2*15^2^0-15^2^2=15^2^+^2^0-15^2^2=15^2^2-15^2^2=0[/tex]
[tex]e).(12-3)^2*(6+3)^1^8-9^2^0=9^2*9^1^8-9^2^0=9^2^+^1^8-9^2^0= \\ =9^2^0-9^2^0=0 \\ f).(4^2:2^2)^2*4^1^8:256^5=[(4:2)^2]^2*(2^2)^1^8:(2^8)^5= \\ =2^4*2^3^6:2^4^0=2^4^+^3^6:2^4^0=2^4^0:2^4^0=1[/tex]