a) 3x – 26= x + 36 b) (12)² × x=56 + 10 × 13x 02/10/2021 Bởi Emery a) 3x – 26= x + 36 b) (12)² × x=56 + 10 × 13x
`#Kenshiro` `a ) 3x – 26= x + 36` `⇔ 3x – 26 + 26 = x + 36 + 26` `⇔ 3x = x + 62` `⇔ 3x – x = x + 62 – x` `⇔ 2x = 62` `⇒ x = 31` `b ) (12)² × x=56 + 10 × 13x` `⇔ 144 xx x = 56 + 130x` `⇔ 144x – 130x = 56` `⇔14x = 56 ⇒ x = 4` Bình luận
Đáp án: `↓↓↓` Giải thích các bước giải: `a)` `3x-26=x+36` `=>3x=x+36+26` `=>3x=x+62` `=>x+62=3x` `=>x=3x-62` `=>3x-x=62` `=>x(3-1)=62` `=>x.2=62` `=>x=31` `————–` `b)` `(12)² × x=56 + 10 × 13x` `=>144x=56+130x` `=>144x=130x+56` `=>130x+56=144x` `=>56=144x-130x` `=>56=x(144-130)` `=>56=x14` `=>x=4` Bình luận
`#Kenshiro`
`a ) 3x – 26= x + 36`
`⇔ 3x – 26 + 26 = x + 36 + 26`
`⇔ 3x = x + 62`
`⇔ 3x – x = x + 62 – x`
`⇔ 2x = 62`
`⇒ x = 31`
`b ) (12)² × x=56 + 10 × 13x`
`⇔ 144 xx x = 56 + 130x`
`⇔ 144x – 130x = 56`
`⇔14x = 56 ⇒ x = 4`
Đáp án:
`↓↓↓`
Giải thích các bước giải:
`a)` `3x-26=x+36`
`=>3x=x+36+26`
`=>3x=x+62`
`=>x+62=3x`
`=>x=3x-62`
`=>3x-x=62`
`=>x(3-1)=62`
`=>x.2=62`
`=>x=31`
`————–`
`b)` `(12)² × x=56 + 10 × 13x`
`=>144x=56+130x`
`=>144x=130x+56`
`=>130x+56=144x`
`=>56=144x-130x`
`=>56=x(144-130)`
`=>56=x14`
`=>x=4`