用简便方法计算. (1)101×67 (2)98.5-42.28-7.72 (3)1.38+14.7+8.62+5.3
来源:学生作业帮 编辑:作业帮 分类:综合作业 时间:2024/09/03 15:37:00
用简便方法计算.
(1)101×67 | (2)98.5-42.28-7.72 | (3)1.38+14.7+8.62+5.3 | (4)3200÷4÷25. |
(1)101×67,
=(100+1)×67,
=100×67+1×67,
=6700+67,
=6767;
(2)98.5-42.28-7.72,
=98.5-(42.28+7.72),
=98.5-50,
=48.5;
(3)1.38+14.7+8.62+5.3,
=(1.38+8.62)+(14.7+5.3),
=10+20,
=30;
(4)3200÷4÷25,
=3200÷(25×4),
=3200÷100,
=32.
=(100+1)×67,
=100×67+1×67,
=6700+67,
=6767;
(2)98.5-42.28-7.72,
=98.5-(42.28+7.72),
=98.5-50,
=48.5;
(3)1.38+14.7+8.62+5.3,
=(1.38+8.62)+(14.7+5.3),
=10+20,
=30;
(4)3200÷4÷25,
=3200÷(25×4),
=3200÷100,
=32.