简便计算 (1)2-6/13*26/9-2/3 (2)1/4*39+3/4*25+3/4*14
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:2024/07/28 09:23:17
简便计算 (1)2-6/13*26/9-2/3 (2)1/4*39+3/4*25+3/4*14
![简便计算 (1)2-6/13*26/9-2/3 (2)1/4*39+3/4*25+3/4*14](/uploads/image/z/575341-61-1.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97+%EF%BC%881%EF%BC%892-6%2F13%2A26%2F9-2%2F3+%282%291%2F4%2A39%2B3%2F4%2A25%2B3%2F4%2A14)
(1)2-6/13*26/9-2/3
=2-4/3-2/3
=2-(4/3+2/3)
=2-2
=0
(2)1/4*39+3/4*25+3/4*14
=1/4*39+(3/4*25+3/4*14)
=1/4*39+3/4*(25+14)
=1/4*39+3/4*39
=39*(1/4+3/4)
=39*1
=39
=2-4/3-2/3
=2-(4/3+2/3)
=2-2
=0
(2)1/4*39+3/4*25+3/4*14
=1/4*39+(3/4*25+3/4*14)
=1/4*39+3/4*(25+14)
=1/4*39+3/4*39
=39*(1/4+3/4)
=39*1
=39
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