C
X x (1/2 + 1/3) = 5/6
X x 5/6 = 5/6
X = 5/6 : 5/6
X = 1
C
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15,07
X x 2,5 = 8,2 + 1,8
X x 2,5 = 10
X = 10 : 2,5
X = 4
1,54
ôi bạn ơi =)
4,5,6