a)
\(\text{ x X 4,2 = 5,376 }\)
\(\text{x = 5,376 : 4,2}\)
\(\text{x = 1.28}\)
b)
\(\text{30,54 - ( 18,79 + 25,31) : 4,2}\)
\(\text{= 30,54 - 44.1 : 4,2}\)
\(\text{= 30,54 - 10,5}\)
\(\text{= 20.04}\)
a)
\(x=5,376:4,2=\dfrac{32}{25}=1,28\)
b) 30,54 - ( 18,79 + 25,31) : 4,2
\(=30,54-44,1:4,2=30,54-10;5=20,04\)
`X x 4,2 = 5,376`
` X = 5,376 : 4,2`
`X = 1,28`
`30,54 - ( 18,79 + 25,31 ) : 4,2`
`= 30,54 - 44,1: 4,2`
`= 30,54 - 10,5`
`=20,04`