45-5x(12+9)
45-5x9+5x12
45-45-60
0-60
=-60
tk nha
45-5 x (12+9)
=45-5x21
=45-105
=-60
45 - 5 x (12 + 9)
= 5 x 9 - 5 x 21
= 5 x (9 - 21)
= 5 x (-12)
= -60
C1:
45-5.(12+9)
=45-5.21
=45-105
=-60
C2:
45-5.(12+9)
=45-[(5.12)+(5.9)]
=45-[60+45]
=45-105
=-60
Tk mk nhé!Thank you!