来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/15 18:15:32
用简便方法计算.
0.25×3.2×1.25; 10.1×4.2; 17.6×84+176×1.6.
(1)0.25×3.2×1.25
=0.25×4×(0.8×1.25)
=1×1
=1;
(2)10.1×4.2
=(10+0.1)×4.2
=10×4.2+0.1×4.2
=42+0.42
=42.42;
(3)17.6×84+176×1.6
=176×8.4+176×1.6
=176×(8.4+1.6)
=176×10
=1760.