作业帮用两种方计算下面个题.(1)1.25×24 (2)9.9×102
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/25 22:01:41
用两种方计算下面个题.(1)1.25×24 (2)9.9×102
用两种方计算下面个题.(1)1.25×24 (2)9.9×102
用两种方计算下面个题.(1)1.25×24 (2)9.9×102
(1)1.25×24 =1.25 ×8×3 = 10 ×3 = 30
1.25 ×24 = 1.25 ×4 ×6 = 5×6 = 30
(2)9.9×102 = 10×102 - 0.1 ×102 = 1020 - 10.2 = 1009.8
9.9 ×102 = 9.9 ×100 + 9.9 ×2 = 990 + 19.8 = 1009.8
(1)1.25×24 =1.25×24 =30,
(1)1.25×24 =1.25×4 ×6=5×6=30
(2)9.9×102=(10-0.1)×102=1020-10.2=1009.8
2)9.9×102=9.9×(100+2)=990+19.8=1009.8
(1)1.25×24
=1.25x8x3
=10x3
=30
(2)9.9×102
=（10-0.1）x102
=1020-10.2
=1009.8