`text{ a, 576 + 678 + 780 - 475 - 577 - 679}`
`text{=( 576 - 475 ) + ( 678 - 577 ) + ( 780 - 679 ) }`
`text{= 101 + 101 + 101 }`
`text{= 303.}`
`text{ b, (126 + 32) x (18 - 16 - 2) }`
`text{ =158 . 0 }`
`text{ = 0}`
`text{c, 36 x 17 x 12 x 34 + 6 x 30 }`
`text{ =6.6.17+6.2.34+6.30}`
`text{ =6. 102 + 6. 68 + 3.30 }`
`text{ =6 . ( 102 + 68 + 30 ) }`
`text{ =6 . 200}`
`text{ = 1200}`
`text{ Xin hay nhất }`