大师作文网16.2÷【64.8-(51.3-2.7)】简便运算
来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/09/21 17:30:39
16.2÷【64.8-(51.3-2.7)】简便运算
16.2÷[64.8-(51.3-2.7)]
=16.2÷(64.8-51.3+2.7)
=16.2÷(13.5+2.7)
=16.2÷16.2
=1
再问：
这里好像输错了
还有一道(2.5÷2+2÷2.5)×0.4简便计算
再答： (2.5÷2+2÷2.5)×0.4 =(5/2×1/2+2×5/2)×2/5 =(5/4+5)×2/5 =5/4×2/5+5×2/5 =1/2+2 =2.5
再问： 您确定吗？我记得答案是0.82
再答： 抱歉 (2.5÷2+2÷2.5)×0.4 =(5/2×1/2+2×2/5)×2/5 =(5/4+4/5)×2/5 =5/4×2/5+4/5×2/5 =1/2+8/25 =0.5+0.32 =0.82
=16.2÷(64.8-51.3+2.7)
=16.2÷(13.5+2.7)
=16.2÷16.2
=1
再问：
这里好像输错了还有一道(2.5÷2+2÷2.5)×0.4简便计算
再答： (2.5÷2+2÷2.5)×0.4 =(5/2×1/2+2×5/2)×2/5 =(5/4+5)×2/5 =5/4×2/5+5×2/5 =1/2+2 =2.5
再问： 您确定吗？我记得答案是0.82
再答： 抱歉 (2.5÷2+2÷2.5)×0.4 =(5/2×1/2+2×2/5)×2/5 =(5/4+4/5)×2/5 =5/4×2/5+4/5×2/5 =1/2+8/25 =0.5+0.32 =0.82