简便算如下!数学的简便算!求简便算法、式!急急!
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/07/16 07:19:04
简便算如下!数学的简便算!求简便算法、式!急急!
第一题列递等式:5.2*49+4.9*48
=
第二题列递等式[智力乐园]:15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12
=
第一题列递等式:5.2*49+4.9*48
=
第二题列递等式[智力乐园]:15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12
=
![简便算如下!数学的简便算!求简便算法、式!急急!](/uploads/image/z/5460025-49-5.jpg?t=%E7%AE%80%E4%BE%BF%E7%AE%97%E5%A6%82%E4%B8%8B%21%E6%95%B0%E5%AD%A6%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%21%E6%B1%82%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95%E3%80%81%E5%BC%8F%21%E6%80%A5%E6%80%A5%21)
1 . 5.2*49+4.9*48
=5.2*4.9*10+4.9*48
=4.9*(52+48)
=4.9*100
=490
2. 15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12
= 6.88*(15.37-9.37)+3.12(15.37-9.37)
=(6.88+3.12)(15.37-9.37)
=10*6
=60
=5.2*4.9*10+4.9*48
=4.9*(52+48)
=4.9*100
=490
2. 15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12
= 6.88*(15.37-9.37)+3.12(15.37-9.37)
=(6.88+3.12)(15.37-9.37)
=10*6
=60