Question

Помогите пожалуйста   вычислить:4/5×5/7,8/9×3/5,9/2×2/9,8/21×7/10,8/15×25/28                     3/5×1/2×4/9,1/2×2/3×3/4×4/5,4/5×10/27×15/16      заранее большое спасибо!!!!                                                                                                                                          

Answer 1

4/5×5/7=47
8/9×3/5=815
9/2×2/9=1
8/21×7/10=415
8/15×25/28=1021           
3/5×1/2×4/9=215
1/2×2/3×3/4×4/5=15
4/5×10/27×15/16=518