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简便运算:(1)55.37-13.62-1.38-5.37(2)45×7.7+3.3×0.8−80%

来源:学生作业帮 编辑:作业帮 分类:综合作业 时间:2024/10/02 16:03:43
简便运算:
(1)55.37-13.62-1.38-5.37
(2)
4
5
×7.7+3.3×0.8−80%
(1)55.37-13.62-1.38-5.37,
=(55.37-5.37)-(13.62+1.38),
=50-15,
=35;

(2)
4
5×7.7+3.3×0.8−80%,
=0.8×7.7+3.3×0.8-0.8,
=0.8×(7.7+3.3-1),
=0.8×(11-1),
=0.8×10,
=8.