`a)`
`1237,9: (37,2 + 62,8) - 5,6`
`=1237,9:100-5,6`
`=12,379-5,6`
`=6,779`
`b)`
`x+8,3=12,03xx4`
`x+8,3=48,12`
`x=48,12-8,3`
`x=39,82`
Vậy `x=39,82`
`@An`
a) 1237,9: (37,2 + 62,8) - 5,6 ?
= 1237,9 : 100 - 5,6
= 12,379 - 5,6
=6,779
b) x + 8,3 = 12,03 x 4
x + 8,3 = 48,12
x = 48,12 - 8,3
x = 39,82
\(a,1237,9:\left(37,2+62,8\right)-5,6\)
\(=1237,9:100-5,6\)
\(=12,379-5,6\)
\(=6,779\)
\(b,x+8,3=12,03\times4\)
\(\Leftrightarrow x+8,3=48,12\)
\(\Leftrightarrow x=48,12-8,3\)
\(\Leftrightarrow x=39,82\)