Giúp ạ !! A. 720 × [41-(2x-5)]=2³ × 5 B. (50-6x)×18= 2³× 3² × 5 C. 49-3(x+6)=13 03/08/2021 Bởi Ruby Giúp ạ !! A. 720 × [41-(2x-5)]=2³ × 5 B. (50-6x)×18= 2³× 3² × 5 C. 49-3(x+6)=13
`a. 720 × [41-(2x-5)]=2³ × 5 ` `720×[41-(2x-5)]=40` `41-(2x-5)=1/18` `2x-5=40(17/18)` `2x=45(17/18)` `x=22(35/36)` `b.(50-6x)×18=2³×3²×5` `(50-6x)×18=360` `50-6x=20` `6x=30` `x=5` `c. 49-3(x+6)=13` `3(x+6)=36` `x+6=12` `x=6` Bình luận
Đáp án: `a) x = 827/36` `b) x = 5` `c) x = 6` Giải thích các bước giải: `a) 720 × [41 – (2x – 5)] = 2^3 × 5` `=> 720 × [41 – (2x – 5)] = 40` `=> 41 – (2x – 5) = 1/18` `=> 2x – 5 = 738/18` `=> 2x = 827/18` `=> x = 827/36` `\text{Vậy} x = 827/36` `b) (50 – 6x) × 18 = 2^3 × 3^2 × 5` `=> (50 – 6x) × 18 = 360` `=> 50 – 6x = 20` `=> 6x = 30` `=> x = 5` `\text{Vậy} x = 5` `c) 49 – 3 × (x + 6) = 13` `=> 3 × (x + 6) = 36` `=> x + 6 = 12` `=> x = 12 – 6` `=> x = 6` `\text{Vậy} x = 6` Học tốt. Nocopy Bình luận
`a. 720 × [41-(2x-5)]=2³ × 5 `
`720×[41-(2x-5)]=40`
`41-(2x-5)=1/18`
`2x-5=40(17/18)`
`2x=45(17/18)`
`x=22(35/36)`
`b.(50-6x)×18=2³×3²×5`
`(50-6x)×18=360`
`50-6x=20`
`6x=30`
`x=5`
`c. 49-3(x+6)=13`
`3(x+6)=36`
`x+6=12`
`x=6`
Đáp án: `a) x = 827/36`
`b) x = 5`
`c) x = 6`
Giải thích các bước giải:
`a) 720 × [41 – (2x – 5)] = 2^3 × 5`
`=> 720 × [41 – (2x – 5)] = 40`
`=> 41 – (2x – 5) = 1/18`
`=> 2x – 5 = 738/18`
`=> 2x = 827/18`
`=> x = 827/36`
`\text{Vậy} x = 827/36`
`b) (50 – 6x) × 18 = 2^3 × 3^2 × 5`
`=> (50 – 6x) × 18 = 360`
`=> 50 – 6x = 20`
`=> 6x = 30`
`=> x = 5`
`\text{Vậy} x = 5`
`c) 49 – 3 × (x + 6) = 13`
`=> 3 × (x + 6) = 36`
`=> x + 6 = 12`
`=> x = 12 – 6`
`=> x = 6`
`\text{Vậy} x = 6`
Học tốt. Nocopy