作业帮用简便方法计算39.98×26+19.99×74-199.9×2.6
来源：学生作业帮助网 编辑：作业帮 时间：2024/10/05 16:05:02
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用简便方法计算39.98×26+19.99×74-199.9×2.6
用简便方法计算39.98×26+19.99×74-199.9×2.6
用简便方法计算39.98×26+19.99×74-199.9×2.6
39.98×26+19.99×74-199.9×2.6
=19.99×2×26+19.99×74-19.9.9×26
=19.99×(2×26+74-26)
=19.99×(26+74)
=19.99×100
=1999