1, tìm x biết:
a, 7.5x : ( 9 - 6\(\frac{13}{21}\) = 2\(\frac{13}{25}\)
b, ( 1.16 - x ) . 5.25 / ( 10\(\frac{5}{9}\)- 7\(\frac{1}{4}\)) . 2\(\frac{2}{17}\)= 75%
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7,5x=6
x=0,8
a, x = 4/5
b, x = 4/25