Đáp án:
`A = 157 + 224 + 176 + 443`
`A = (157 + 443) + (224 + 176)`
`A = 600 + 400`
`A = 1000`
`B =(173-462)-(74-462)`
`B = 173 - 462 - 74 + 462`
`B = (173 - 74) - [(-462) + 462] `
`B = 99 - 0`
`B = 99`
`C = (3^13.99-15.3^14):(3^17:3^2)`
`C = (3^13. 99-15.3^13. 3):3^15`
`C = 3^13 . (99-15.3) : 3^15`
`C = 3^13. 54 :3^15`
`C = 3^13 :3^15 . 54`
`C = 1/9 . 54`
`C = 6`