tentukan hasil penjumlahan dan pengurangannya c)3/4 + (-2 1/5) - 45%

2 1/5=11/5
45%=45/100 atau 9/20

3/4 - 11/5 + 9/20
=>[15-44+9]/20
=>-20/20
=>-1

3/4 + (-2 1/5) - 45%
= 3/4 + (-11/5) - 45/100
= 3/4 - 11/5 - 9/20
= 15/20 - 44/20 - 9/20
= -38/20
= - 1 18/20
= - 1 9/10