简便计算(比较简单哦)
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/07/11 16:22:59
简便计算(比较简单哦)
第一道题是:7.816乘1.45+3.14乘2.184+1.69乘乘7.816
第二道题是:99999乘77778+33333乘66666
第一道题是:7.816乘1.45+3.14乘2.184+1.69乘乘7.816
第二道题是:99999乘77778+33333乘66666
![简便计算(比较简单哦)](/uploads/image/z/10267026-42-6.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%EF%BC%88%E6%AF%94%E8%BE%83%E7%AE%80%E5%8D%95%E5%93%A6%EF%BC%89)
1.7.816x1.45+3.14x2.184+1.69x7.816
=(7.816x1.45+1.69x7.816)+3.14x2.184
=7.816x(1.45+1.69)+3.14x2.184
=7.816x3.14+3.14x2.184
=3.14x(7.816+2.184)
=3.14x10
=31.4
2.99999x77778+33333x66666
=99999x77778+99999x22222
=99999x(77778+22222)
=99999x100000
=9999900000
=(7.816x1.45+1.69x7.816)+3.14x2.184
=7.816x(1.45+1.69)+3.14x2.184
=7.816x3.14+3.14x2.184
=3.14x(7.816+2.184)
=3.14x10
=31.4
2.99999x77778+33333x66666
=99999x77778+99999x22222
=99999x(77778+22222)
=99999x100000
=9999900000