用简便方法计算:57.6×1.6+28.8×36.8-14.4×80.
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/05 07:00:54
用简便方法计算:57.6×1.6+28.8×36.8-14.4×80.
57.6×1.6+28.8×36.8-14.4×80
=57.6×1.6+28.8×2×18.4-14.4×4×20
=57.6×1.6+57.6×18.4-57.6×20
=57.6×(1.6+18.4-20)
=0
=57.6×1.6+28.8×2×18.4-14.4×4×20
=57.6×1.6+57.6×18.4-57.6×20
=57.6×(1.6+18.4-20)
=0