Tính hộ tôi cái này với nha
I=(4x-5)×3-12x+21
`I=(4x-5)xx3-12x+21`
`=12x-15-12+21`
`=-15+21`
`=6`
Vậy `I=6`
`=4x xx3-5xx3-12x+21`
`=12x-15-12x+21`
`=(12x-12x)+(21-15)`
`=0+6`
`=6``Vậy` `I=6`
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