a. ta có : 2x + 2x+3 = 144=
2x + 2xnhân 23=144
2x(1 + 23) =144
2x nhân 9 =144
2x = 144 : 9
2x = 16
2x = 24
suy ra : x = 4
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bai 1; so sanh
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dau / nay la dau chia
dau . nay la nhan do nhe!!!!
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