Question

几道简便运算的题目.1又1/4-0.78+2.75 5又2/5+2又7/9-4.4 4.8+3又5/6-1/6+5又1/

Answer 1

1又1/4-0.78+2.75

=1 + 0.25 + 2.75 -0.78

= 4 - 0.78

= 3 .22

5又2/5+2又7/9-4.4

= 5 + 0.4-4.4 + 2 + 7/9

= 3 又 九分之七

4.8+3又5/6-1/6+5又1/5

= 4.8 + 3+ (5/6 - 1/6) + 5+ 1/5

= 4.8 + 0.2+ 8 + 2/3

= 13 又 三分之二