计算下面各题，能简算的要简算10.4-9.6×0.54.23+4.23×990.45×1025.28×6.5+12.312.8×0.5×0.212.5×32．

Question

计算下面各题，能简算的要简算

10.4-9.6×0.5	4.23+4.23×99	0.45×102
5.28×6.5+12.3	12.8×0.5×0.2	12.5×32．

Answer 1

①10.4-9.6×0.5
=10.4-9.6×0.5
=10.4-4.8
=5.6

②4.23+4.23×99
=4.23×（99+1）
=4.23×100
=423

③0.45×102
=0.45×（100+2）
=0.45×100+0.45×2
=45+0.9
=45.9

④5.28×6.5+12.3
=34.32+12.3
=46.62

⑤12.8×0.5×0.2
=12.8×（0.5×0.2）
=12.8×0.1
=1.28

⑥12.5×32
=（12.5×8）×4
=100×4
=400