a) -3/4*1/3+17/8-|4/5|-1 b) 6^2+3*6^2+3^2 phần -13 c)46*9^5+6^9*120 phần 8^4*3^12-6^11

a) (-3/4)*(1/3) + (17/8) – |4/5| -1 

= (-1/4) + (17/8) – (4/5) -1

= (-2/8) + (17/8) – (4/5) – (5/5)

= (15/8) – (9/5)

= (75/40) – (72/40)

= 3/40 

b) 6² +3*6²+ (3²/-13)

= 6².(1 +3) + (3²/-13)

= 36.4 + (9/-13)

= 144 + (9/-13)

= 1863/13