495÷[ 15╳(69÷23)]=
One (48 ten 36)] 788 =
12 ╳ [1622 ÷ (21-3)] One =
540 ÷ (36 ╳ 2) =
540÷3 16 ╳ 2 =
540÷[((3+6)╳2]=
180÷(36÷ 12)+6=
180÷(36÷ 12+6))=
180÷[36÷( 12+6)]=