Đáp án:
Giải thích các bước giải:
17, a, 3.5/8.24=3.5/8.3.8=5/64
b, 2.14/7.8=2.2.7/7.2.2.2=1/2
c, 3.7.11/22.9 =3.7.11/2.11.3.3=7/6
d, (8.5-8.2)/16=8(5-2)/16=8.3/8.2=3/2
e, (11.4-11)/2-13=11(4-1)/(-11)=-3
18, a, 20p=20/60=1/3 (h)
b, 35p=35/60=7/12 (h)
c, 90p= 90/60 =3/2 (h)
20, -9/33=3/-11
15/9=5/3
-12/19=60/-95
21. 14/20
22, 2/3=40/60
3/4=45/60
4/5=48/60
5/6=50/60