Điền số thích hợp vào chỗ chấm:

7 kg 35 g = ............. g	2 phút 30 giây = ........... giây
3 tấn 5 tạ = ........... tạ	15 m2 2 cm2 = ......... cm2

a) 305 ´ 328 + 305 ´ 671 + 305

b) \(\frac{{11}}{4} \times \frac{8}{{14}} \times \frac{7}{{11}} \times \frac{5}{3}\)

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a) \(\frac{2}{3} + \frac{4}{9} = \)............................................

b) \(\frac{4}{5} \times \frac{3}{8} = \)............................................

c) \(\frac{2}{3} - \frac{1}{{12}} = \)............................................

d) \(\frac{1}{2}:\frac{2}{5} = \)............................................