简便计算,能简便的就简便
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:2024/07/26 11:33:48
简便计算,能简便的就简便
4.15-3.75×10%-5/8 1-39%×1/2÷0.195 8×40%+2/5÷1/2
4.15-3.75×10%-5/8 1-39%×1/2÷0.195 8×40%+2/5÷1/2
![简便计算,能简便的就简便](/uploads/image/z/19540496-56-6.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%2C%E8%83%BD%E7%AE%80%E4%BE%BF%E7%9A%84%E5%B0%B1%E7%AE%80%E4%BE%BF)
第一题:
4.15-3.75×10%-5/8
=4.15-0.375-0.625
=4.15-(0.375+0.625)
=4.15-1
=3.15
第二题:
1-39%×1/2÷0.195
=1-0.195÷0.195
=1-1
=0
第三题:
8×40%+2/5÷1/2
=8×0.4+0.4×2
=(8+2)×0.4
=4
4.15-3.75×10%-5/8
=4.15-0.375-0.625
=4.15-(0.375+0.625)
=4.15-1
=3.15
第二题:
1-39%×1/2÷0.195
=1-0.195÷0.195
=1-1
=0
第三题:
8×40%+2/5÷1/2
=8×0.4+0.4×2
=(8+2)×0.4
=4