四、在$◯$里填上“>”“<”或“=”。
$\frac{3}{4}×\frac{1}{4}◯$
$\frac{1}{6}×\frac{7}{8}+\frac{5}{12}×\frac{1}{6}◯$
$\frac{3}{4}×\frac{1}{4}◯$
<
$\frac{3}{4}+\frac{1}{4}$ $\frac{1}{19}×20◯$=
$\frac{1}{19}×19+\frac{1}{19}$$\frac{1}{6}×\frac{7}{8}+\frac{5}{12}×\frac{1}{6}◯$
>
$\frac{1}{6}$ $(\frac{1}{4}×\frac{1}{5})×\frac{4}{7}◯$<
$(\frac{1}{4}+\frac{1}{5})×\frac{4}{7}$
答案:
< = > <
1. 为响应党的二十大号召,推动坚持可持续发展,坚持节约优先的方针。经了解,我们产生的废纸经过加工可以生产出相当于废纸原来质量$\frac{4}{5}$的再生纸。六年级(1)班一星期收集废纸7.3千克,六年级(2)班一星期收集废纸6.2千克,这两个班一星期收集的废纸一共可以生产出多少千克的再生纸?
答案:
$(7.3+6.2)×\frac{4}{5}=10.8$(千克)
2. 两种中国结各做18个,共需要彩绳多少米?

答案:
$(\frac{2}{5}+\frac{3}{5})×18=18$(m)
六、巧思妙算。
$98×\frac{4}{5}+13×\frac{4}{5}-\frac{4}{5}$ $\frac{11}{32}×\frac{5}{19}+\frac{5}{32}×\frac{8}{19}$ $\frac{47}{124}×126$
$98×\frac{4}{5}+13×\frac{4}{5}-\frac{4}{5}$ $\frac{11}{32}×\frac{5}{19}+\frac{5}{32}×\frac{8}{19}$ $\frac{47}{124}×126$
答案:
$98×\frac{4}{5}+13×\frac{4}{5}-\frac{4}{5}=(98+13-1)×\frac{4}{5}=110×\frac{4}{5}=88$
$\frac{11}{32}×\frac{5}{19}+\frac{5}{32}×\frac{8}{19}=\frac{5}{32}×\frac{11}{19}+\frac{5}{32}×\frac{8}{19}=\frac{5}{32}×(\frac{11}{19}+\frac{8}{19})=\frac{5}{32}$
$\frac{47}{124}×126=\frac{47}{124}×(124+2)=\frac{47}{124}×124+\frac{47}{124}×2=47\frac{47}{62}$
$\frac{11}{32}×\frac{5}{19}+\frac{5}{32}×\frac{8}{19}=\frac{5}{32}×\frac{11}{19}+\frac{5}{32}×\frac{8}{19}=\frac{5}{32}×(\frac{11}{19}+\frac{8}{19})=\frac{5}{32}$
$\frac{47}{124}×126=\frac{47}{124}×(124+2)=\frac{47}{124}×124+\frac{47}{124}×2=47\frac{47}{62}$
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