Question

[Phùng Thị Thảo Linh]

Tính nhanh

75 % x y + \(\frac{3}{4}\)x y + \(\frac{1}{2}\)x y = 30

Answer 1

[Emma]

 \(\frac{75}{100}\)\(\times y+\frac{3}{4}\)\(\times y+\frac{1}{2}\)\(\times y=30\)

y x ( \(\frac{75}{100}\)+ \(\frac{3}{4}\)+ \(\frac{1}{2}\)) = 30

y x 2 = 30

y       = 30 : 2

y      = 15.

Hok tốt !