isi cara ya!!! makasih no. 1,2 &3

1.45+56*48-216:9=45+2688-24
=2733-24=2709

3. 19*27+5205:15-269
=513 +347 -269
=860 -269=591

2.(-9)-6*(-72):16-20
=(-9)-(-432):16-20
=(-9)- (-27) -20
= 18 -20
= -2