1.5x0.32x1.25（用简便方法计算）5.24＋5.24x99（用简便方法计算）0.8x［13－（3.12＋5.28）］7.45x5.2➗2.6（怎样简便就怎样计算）

Question

1.5x0.32x1.25（用简便方法计算）5.24＋5.24x99（用简便方法计算）0.8x［13－（3.12＋5.28）］7.45x5.2➗2.6（怎样简便就怎样计算）

Answer 1

1.5×0.32×1.25
=(1.5×0.4)×(0.8×1.25)
=0.6×1
=0.6
5.24+5.24×99
=5.24×(1+99)
=5.24×100
=524
0.8×[13-(3.12+5.28)]
=0.8×(13-8.4)
=0.8×4.6
=(1-0.2)×4.6
=4.6-0.92
=3.68
7.45×5.2÷2.6
=7.45×(5.2÷2.6)
=7.45×2
=14.9