Question

( 4, 9 - x ) : 1,2 =3
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3, 8 × ( x - 0, 2 ) = 2, 28​

Answer 1

$(4.9 - x) \div 1.2 = 3 \\ 4.9 - x = 3 \times 1.2 \\ 4.9 - x = 3.6 \\ x = 4.9 - 3.6 \\ x = 1.3$

$3.8 \times (x - 0.2) = 2.28 \\ x - 0.2 = 2.28 \div 3.8 \\ x - 0.2 = 0.6 \\ x = 0.2 + 0.6 \\ x = 0.8$