Đáp án:
Giải thích các bước giải:
$\text{Bài 1: Tìm x, biết:}$
`1) x : 7 x 18 = 6973 - 5839`
`x : 7 x 18 =1134`
` x : 7 = 1134 : 18`
`x : 7 = 63`
`x = 63 x 7 `
` x = 441.`
`2) x : 3 + 840 = 4938 - 924`
`x : 3 + 840 = 4014`
` x : 3 = 4014 - 840`
` x : 3 = 3174`
`x = 3174 x 3`
` x = 9522.`
`3) 479 - x x 5 = 896 : 4`
`479 - x x 5 = 224.`
`479 - x = 224 : 5`
`479 - x = 44,8`
`x = 479 - 44,8`
`x = 434,2.`
`4) 3179 : x + 999 = 593 x 2`
`3179 : x + 999 = 1186.`
`3179 : x = 1186 - 999`
`3179 : x = 187.`
` x = 3179 : 187`
` x = 17.`
`5) 1023 + x - 203 = 9948 : 12`
`1023 + x - 203 = 829.`
`1023 + x = 829 + 203`
`1023 + x = 1032`
`x = 1032 - 1023`
`x = 9.`
`6) 583 x x + 8492 = 429 900 - 1056`
`583 x x + 8492 = 428 844 `
`583 x x = 428 844 - 8492`
`583 x x = 420 352`
`x = 420 352 : 583`
` x = 721,0 154 374.`
`7) ( 1848 + x ) : 23 = 83`
` 1848 + x = 83 x 23`
`1848 + x = 1909`
`x = 1909 - 1848`
`x = 61.`
`8) ( 4282 + x ) x 8 = 84 392`
`4282 + x = 84 392 : 8`
`4282 + x = 10 549`
` x = 10 549 - 4282`
`x = 6267.`
