简便运算 1.5/7×1/4+1/4×2/7 2.100×(1/5+3/20+4/25) 3.1/5×50+50*4/5 4.2/9*8+2/9

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/28 17:58:00
简便运算1.5/7×1/4+1/4×2/72.100×(1/5+3/20+4/25)3.1/5×50+50*4/54.2/9*8+2/9简便运算1.5/7×1/4+1/4×2/72.100×(1/5+

简便运算 1.5/7×1/4+1/4×2/7 2.100×(1/5+3/20+4/25) 3.1/5×50+50*4/5 4.2/9*8+2/9
简便运算 1.5/7×1/4+1/4×2/7 2.100×(1/5+3/20+4/25) 3.1/5×50+50*4/5 4.2/9*8+2/9

简便运算 1.5/7×1/4+1/4×2/7 2.100×(1/5+3/20+4/25) 3.1/5×50+50*4/5 4.2/9*8+2/9
1.5/7×1/4+1/4×2/7
=1/4x(5/7+2/7)
=1/4x1
=1/4
2.100×(1/5+3/20+4/25)
=100x1/5+100x3/20+100x4/25
=20+15+16
=51
3.1/5×50+50*4/5
=50x(1/5+4/5)
=50x1
=50
4.2/9*8+2/9
=2/9x(8+1)
=2/9x9
=2

5/7×1/4+1/4×2/7=1/4(5/7+2/2)=1/4*1=1/4
100×(1/5+3/20+4/25)=100*1/5+100*3/20+100*4/25=20+15+16=51
1/5×50+50*4/5=50(1/5+4/5)=50*1=50
.2/9*8+2/9=2/9(8+1)=2/9*9=2
不懂可以追问欢迎
采纳