Question

Đã trả lời bởi chuyên gia

Answer 1

Ta có :

$A . x + \frac{1}{4} = 1 \frac{1}{2} = > x + \frac{1}{4} = \frac{3}{2} = > x = \frac{3}{2} - \frac{1}{4} = > x = \frac{5}{4} B . x - \frac{1}{3} = 1 \frac{5}{6} = > x - \frac{1}{3} = \frac{11}{6} = > x = \frac{11}{6} + \frac{1}{3} = > x = \frac{13}{6} C . \frac{17}{5} : x = \frac{34}{5} : \frac{4}{3} = > \frac{17}{5} : x = \frac{34}{5} \times \frac{3}{4} = > \frac{17}{5} : x = \frac{102}{20} = > x = \frac{17}{5} : \frac{102}{20} = > x = \frac{17}{5} \times \frac{20}{102} = > x = \frac{2}{3} D . x : \frac{4}{5} = \frac{25}{8} : \frac{5}{4} = > x : \frac{4}{5} = \frac{25}{8} \times \frac{4}{5} = > x : \frac{4}{5} = \frac{5}{2} = > x = \frac{5}{2} \times \frac{4}{5} = > x = 2 E . (x - \frac{1}{2}) \times \frac{5}{3} = \frac{7}{4} - \frac{1}{2} = > (x - \frac{1}{2}) \times \frac{5}{3} = \frac{7}{4} - \frac{2}{4} = > (x - \frac{1}{2}) \times \frac{5}{3} = \frac{5}{4} = > x - \frac{1}{2} = \frac{5}{4} : \frac{5}{3} = > x - \frac{1}{2} = \frac{5}{4} \times \frac{3}{5} = > x - \frac{1}{2} = \frac{3}{4} = > x = \frac{3}{4} + \frac{1}{2} = > x = \frac{5}{4}$

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Answer 2

Ta có :

$A . x + \frac{1}{4} = 1 \frac{1}{2} = > x + \frac{1}{4} = \frac{3}{2} = > x = \frac{3}{2} - \frac{1}{4} = > x = \frac{5}{4} B . x - \frac{1}{3} = 1 \frac{5}{6} = > x - \frac{1}{3} = \frac{11}{6} = > x = \frac{11}{6} + \frac{1}{3} = > x = \frac{13}{6} C . \frac{17}{5} : x = \frac{34}{5} : \frac{4}{3} = > \frac{17}{5} : x = \frac{34}{5} \times \frac{3}{4} = > \frac{17}{5} : x = \frac{102}{20} = > x = \frac{17}{5} : \frac{102}{20} = > x = \frac{17}{5} \times \frac{20}{102} = > x = \frac{2}{3} D . x : \frac{4}{5} = \frac{25}{8} : \frac{5}{4} = > x : \frac{4}{5} = \frac{25}{8} \times \frac{4}{5} = > x : \frac{4}{5} = \frac{5}{2} = > x = \frac{5}{2} \times \frac{4}{5} = > x = 2 E . (x - \frac{1}{2}) \times \frac{5}{3} = \frac{7}{4} - \frac{1}{2} = > (x - \frac{1}{2}) \times \frac{5}{3} = \frac{7}{4} - \frac{2}{4} = > (x - \frac{1}{2}) \times \frac{5}{3} = \frac{5}{4} = > x - \frac{1}{2} = \frac{5}{4} : \frac{5}{3} = > x - \frac{1}{2} = \frac{5}{4} \times \frac{3}{5} = > x - \frac{1}{2} = \frac{3}{4} = > x = \frac{3}{4} + \frac{1}{2} = > x = \frac{5}{4}$

Answer 3

Ta có :

A.x+14=112=>x+14=32=>x=32−14=>x=54B. x−13=156=>x−13=116=>x=116+13=>x=136C. 175:x=345:43=>175:x=345×34=>175:x=10220=>x=175:10220=>x=175×20102=>x=23D. x:45=258:54=> x:45=258×45=> x:45=52=> x=52×45=> x=2E. (x−12)×53=74−12=> (x−12)×53=74−24=> (x−12)×53=54=>x−12=54:53=>x−12=54×35=>x−12=34=>x=34+12=>x=54

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