Đáp án:
Giải thích các bước giải:
`197 ≤ xx + xx < 199`
`-> xx + xx in { 197; 198 }`
-Ta có: `197 : 2 = 98,5`
`198 : 2 = 99`
`-> xx in { 98,5; 99 }`
`#Dung09`
197 ≥ xx + xx < 199
⇒ xx + xx = 198 .
- 198 = 137 + 40 .
Vậy : 197 ≥ 137 + 40 <199 .
mọi giúp em với em mắc bài hình quá :<
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