64. (а*у)3 (-3b ^3)^3 (4a*b)^2 (-2a*b)^5 (-4/3 a*b)^3 (2 m*n)^10
68. (1/4)^6*4^6=1 3^4*2^4=81*16=1296
2^5*2^5*3^5/3^5=2^10=1024
(1/2)^5*2^10=2^5=32
(13/5)^15 *(5/13)^14=13/5=2.6
(1/8)^10*8^8= 1/64
69. у^12 (-x)^12 m^9 m^20 a^42 a^26 (-a)^15*(-a)^28/a ^12=-a^31
a^32/a^27*а= a^6
70 2^24/2^16=2^8=256
(11)^ 12/(11)10 =11^2= 121
7^21/7^19=7^2=49
(2^4)^2*2^3=2^8*2^3=2^11=2048
10^23/10^21=10^2=100
(3^2)^3(3^4)2/3^12= 3^6*3^8/3^12= 3^14/3^12 = 3^2=9
71, 2^9*3^9/2^7*3^7= 2^2*3^2=4*9=36
2^7*9^7/2^6*9^6=2*9=18
7^9*5^8/7^8*5^8=7
2^9*5^14/2^7*5^14=2^2=4
2^16*5^16/2^15*5^14=2*5^2=50
5^6*3^12/3^3/5^6=3^9=19683
72 m ^10 не равно m^24 m^12 не равно m^5
a^4d^4 не равно a^8 b^8
a ^6 не равно a^2