速求答复!①75×1/17+15/17×12②2×1/5+4×2/11+4×2/5+3×4/11新人悬赏不多只求答复

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 07:36:36

速求答复!①75×1/17+15/17×12②2×1/5+4×2/11+4×2/5+3×4/11新人悬赏不多只求答复
速求答复!
①75×1/17+15/17×12
②2×1/5+4×2/11+4×2/5+3×4/11
新人悬赏不多
只求答复

速求答复!①75×1/17+15/17×12②2×1/5+4×2/11+4×2/5+3×4/11新人悬赏不多只求答复
①75×1/17+15/17×12
=15/17×(5+12)
=15/17×17
=15

②2×1/5+4×2/11+4×2/5+3×4/11
=2/5×(1+4)+4/11×(2+3)
=2/5×5+4/11×5
=2+20/11
=3又9/11

75*1/17+15/17*12 = 15


(2)2*1/5+4*2/11+4*2/5+3*4/11 = 3.8181818181818
希望采纳

①75×1/17+15/17×12
=75/17+75/17×12/5
=75/17 *(1+ 12/5)
=75/17 *(17/5)
=15
②2×1/5+4×2/11+4×2/5+3×4/11
=2×1/5+2×4/5+4×2/11+6×2/11
=2×(1/5+4/5)+(4+6)×2/11
=2+20/11
=42/11

祝你学习进步,更上一层楼! (*^__^*)

(1)=(75+15×12)/17=(15×5+15×12)/17=(15×17)/17=15
(2)=(2+4×2)/5+(4×2+4×3)/11=2+(4×(2+3))/11=42/11=3又9/11
第二题怪怪的,是不是题目有问题,怎么不是整数

①75×1/17+15/17×12=75/17+180/17=255/17=15
②2×1/5+4×2/11+4×2/5+3×4/11=22/55+40/55+88/55+60/55=210/55=3+9/11