Question

Tính bằng cách thuận tiện.

a) (125 × 0,67) × 8                            b) \(\dfrac{8}{9}\times\dfrac{7}{11}+\dfrac{4}{11}\times\dfrac{8}{9}\)

Answer 1

a) (125 x 0,67) x 8 = (125 x 8) x 0,67 = 1 000 x 0,67 = 670

b) $\frac{8}{9} \times \frac{7}{{11}} + \frac{4}{{11}} \times \frac{8}{9} = \frac{8}{9} \times \left( {\frac{7}{{11}} + \frac{4}{{11}}} \right) = \frac{8}{9} \times 1 = \frac{8}{9}$