307-[ ( 180-160) : 2² + 9] : 2
=307-[ 20 : 4 + 9] : 2
=307-[ 5+ 9] : 2
=307-14 : 2
=307-7
=300
205 - [(1200 - (4^2 - 2 . 3)^3 ] : 40
= 205 - [(1200 - (16 - 2 . 3)^3 ] : 40
= 205 - [1200 - (16 - 6)^3 ] : 40
= 205 - [1200 - 10^3 ] : 40
= 205 - [1200 - 1000 ] : 40
= 205 - 200 : 40
= 205 - 5
= 200
177 : [ 2 . ( 4^2 -9 ) + 3^2 (15 -10)] = 177 : [ 2 . (16 - 9) + 9 . 5 ]
= 177 : [ 2 . 7 + 9 .5 ]
= 177 : [ 14 + 45 ]
= 177 : 59 =3
[(25 - 2^2 . 3) + (3^2 . 4 + 16)] : 5
= [(25 - 4 . 3) + (9 . 4 + 16)] : 5
= [(25 - 12) + (36 + 16)] : 5
= [13 + (36 + 16)] : 5
= [13 + 52] : 5
= 65 : 5
= 13
125(28+72)-25(3^2.4+64)
=125.100-25(9.4+64)
=125.100-25(36+64)
=125.100-25.100
=(125-25).100
=100.100=10000