Giải SGK Toán 5 KNTT Bài 9. Luyện tập chung có đáp án

$\frac{16}{9}\times \left(6 : \frac{32}{9}\right)- \frac{7}{5}$= $\frac{16}{9}\times \left(6 \times \frac{9}{32}\right)- \frac{7}{5}= \frac{16}{9}\times \left(2 \times 3 \times \frac{9}{16 \times 2}\right)-\frac{7}{5}$

= $\frac{16}{9}\times \frac{3\times 9}{16}-\frac{7}{5}= 3 -\frac{7}{5}= \frac{15}{5}- \frac{7}{5}= \frac{8}{5}$

524 × 63 + 524 × 37 – 2 400 = 524 × (63 + 37) – 2 400

= 524 × 100 – 2 400

= 52 400 – 2 400

= 50 000

$\frac{7}{9}\times \frac{6}{5}+\frac{6}{5}\times \frac{2}{9}+\frac{4}{5}=\frac{6}{5}\times \left(\frac{7}{9}+\frac{2}{9}\right)+\frac{4}{5}$

= $\frac{6}{5}\times 1+\frac{4}{5}$

= $\frac{6}{5}+\frac{4}{5}$

= $\frac{10}{5}=2$