Question

用简便方法计算下面各题。

5.62-3.4+4.38 365+289+135 56×9.9+5.6
八分之七×九分之十三+九分之十三÷8
32×五分之一+67÷5+0.2

Answer 1

5.62-3.4+4.38
=5.62+4.38-3.4
=10-3.4
=6.6

365+289+135
=365+135+289
=500+289
=789

56×9.9+5.6
=5.6*99+5.6
=5.6(99+1)
=5.6*100
=560

八分之七×九分之十三+九分之十三÷8
=八分之七×九分之十三+九分之十三*1/8
=(13/9)(7/8+1/8)
=13/9

32×五分之一+67÷5+0.2
=32*0.2+67*0.2+0.2
=0.2(32+67+1)
=0.2*100
=20

不懂可追问
满意请采纳
谢谢

追问

最后一题为什么有3个0.2

追答

32×五分之一+67÷5+0.2
=32*(1/5)+67*(1/5)+0.2

1/5=0.2

追问

那也只有两个0.2啊

追答

32×五分之一+67÷5+0.2
=32*(1/5)+67*(1/5)+0.2
=32*0.2+67*0.2+0.2

不是3个0.2吗？

追问

哦

Answer 2

5.62-3.4+4.38
=5.62+4.38-3.4
=10-3.4
=6.6

365+289+135
=365+135+289
=500+289
=789

56×9.9+5.6
=5.6x99+5.6
=5.6x（99+1）
=5.6x100
=560

祝你学习进步，有不明白的可以追问！谢谢！！

Answer 3

5.62-3.4+4.38
=5.62+4.38-3.4
=10-3.4
=6.6

365+289+135
=365+135+289
=500+289
=789

56×9.9+5.6
=56×9.9+56×0.1
=56(9.9+0.1)
=560

Answer 4

5.62-3.4+4.38
=5.62+4.38-3.4
=10-3.4
=6.6
365+289+135 56×9.9+5.6
=365+135+289
=500+289
=789
56×9.9+5.6
=5.6×（99+1）
=5.6×100
=560

追问

还有两题

追答

速度发

追问

题目有啊

追答

八分之七×九分之十三+九分之十三÷8
=（13/9）(7/8+1/8)
=13/9
32×五分之一+67÷5+0.2
=(1/5)(32+67+1)
=(1/5)×100
=20

Answer 5

5.62-3.4+4.38
=5.62+4.28-3.4
=10.9-3.4
=7.5

365+289+135
=365+135+289
=500+289
=789

56×9.9+5.6
=5.6x(99+1)
=5.6x100
=560