Buổi chiều cửa hàng bán được số ki-lô-gam gạo là:

\(\frac{1}{3}\) x (250 - 100) = 50 (kg)

Cả hai buổi cửa hàng bán được số ki-lô-gam gạo là:

100 + 50 = 150 (kg)

Đáp số: 150 kg gạo.

a) Chó

b) 6

c) 4

a) 20 × 3246 × 5 = 100 x 3246 = 324600

b) 346 × 53 + 346 × 47 = 346 x (53 + 47) = 346 x 100 = 34600

a) 10 km

b) 4 g

c) 30 ml

d) 40 phút

a) \(\frac{7}{24}\) \(+\) \(\frac{13}{6}\) = \(\frac{7}{24}\) + \(\frac{52}{24}\) = \(\frac{59}{24}\)

b) \(\frac{12}{49}\) − \(\frac{1}{7}\) = \(\frac{12}{49}\) - \(\frac{7}{49}\) = \(\frac{5}{49}\)

c) \(\frac{5}{8}\) \(\times\) \(\frac{24}{25}\) = \(\frac{120}{200}\) = \(\frac{12}{20}\) = \(\frac35\)

d) \(\frac{38}{21}\) \(:\) \(\frac{19}{3}\) = \(\frac{38}{21}\) x \(\frac{3}{19}\) = \(\frac{114}{399}\) = \(\frac{38}{133}\)

a) \(\frac{7}{24}\) \(+\) \(\frac{13}{6}\) = \(\frac{7}{24}\) + \(\frac{52}{24}\) = \(\frac{59}{24}\)

b) \(\frac{12}{49}\) − \(\frac{1}{7}\) = \(\frac{12}{49}\) - \(\frac{7}{49}\) = \(\frac{5}{49}\)

c) \(\frac{5}{8}\) \(\times\) \(\frac{24}{25}\) = \(\frac{120}{200}\) = \(\frac{12}{20}\) = \(\frac35\)

d) \(\frac{38}{21}\) \(:\) \(\frac{19}{3}\) = \(\frac{38}{21}\) x \(\frac{3}{19}\) = \(\frac{114}{399}\) = \(\frac{38}{133}\)

a) 34287 x 65 = 2228655

b) 557130 : 42 = 13265