Tìm x X × 1/2 = 3/4 – 2/5 3 – x = 4/5 + 1/2 18/09/2021 Bởi Lydia Tìm x X × 1/2 = 3/4 – 2/5 3 – x = 4/5 + 1/2
Đáp án + Giải thích các bước giải: `x xx 1/2 = 3/4 – 2/5` `x xx 1/2 = 15/20 – 8/20` `x xx 1/2 = 7/20` `x = 7/20 :1/2` `x = 7/20 . 2 ` `x = 7/10` ` – – – – – –` `3 – x = 4/5 + 1/2` `3 – x = 8/10 + 5/10` `3 – x = 13/10` `x = 3 – 13/10` `x = 30/10 – 13/10` `x = 17/10` Bình luận
`X xx 1/2 = 3/4 – 2/5` `X xx 1/2 = 15/20 – 8/20` `X xx 1/2 = 7/20` `X = 7/20 : 1/2` `X = 7/20 xx 2` `X = (7xx2)/20` `X = 14/20` `X = (14:2)/(20:2)` `X = 7/10` Vậy `X = 7/10` `3 – x = 4/5 + 1/2` `3 – x = 8/10 + 5/10` `3 – x = 13/10` `x = 3 – 13/10` `x = 30/10 – 13/10` `x = (30-13)/10` `x = 17/10` `x = 17/10` Vậy `x = 17/10` Bình luận
Đáp án + Giải thích các bước giải:
`x xx 1/2 = 3/4 – 2/5`
`x xx 1/2 = 15/20 – 8/20`
`x xx 1/2 = 7/20`
`x = 7/20 :1/2`
`x = 7/20 . 2 `
`x = 7/10`
` – – – – – –`
`3 – x = 4/5 + 1/2`
`3 – x = 8/10 + 5/10`
`3 – x = 13/10`
`x = 3 – 13/10`
`x = 30/10 – 13/10`
`x = 17/10`
`X xx 1/2 = 3/4 – 2/5`
`X xx 1/2 = 15/20 – 8/20`
`X xx 1/2 = 7/20`
`X = 7/20 : 1/2`
`X = 7/20 xx 2`
`X = (7xx2)/20`
`X = 14/20`
`X = (14:2)/(20:2)`
`X = 7/10`
Vậy `X = 7/10`
`3 – x = 4/5 + 1/2`
`3 – x = 8/10 + 5/10`
`3 – x = 13/10`
`x = 3 – 13/10`
`x = 30/10 – 13/10`
`x = (30-13)/10`
`x = 17/10`
`x = 17/10`
Vậy `x = 17/10`