Question

Rút gọn:

a) 3.5/8.24                             b)2.14/7.8                                  c) 3.7.11/22.9

d)8 .5- 8 .2/ 16                            e)11.4-11/2-13

( Các bạn giúp mình nhé...ghi rõ cả cách làm)

Answer 1

\(\frac{3.5}{8.24}=\frac{3.5}{2^3.2^3.3}=\frac{1.5}{8.8.1}=\frac{5}{64}\)

\(\frac{2.14}{7.8}=\frac{2.7.2}{7.2^3}=\frac{1.7}{7.2}=\frac{1}{2}\)

\(\frac{3.7.11}{22.9}=\frac{1.7.11}{11.2.3}=\frac{1.7.1}{1.2.3}=\frac{7}{6}\)

\(\frac{8.5-8.2}{16}=\frac{8\left(5-2\right)}{8.2}=\frac{8.3}{8.2}=\frac{1.3}{1.2}=\frac{3}{2}\)

\(\frac{11.4-11}{2-13}=\frac{11\left(4-1\right)}{-11}=\frac{11.3}{-11}=-3\)

Answer 2

Bài 17 (Sgk Toán 6 Trang 15)

a) 3.5/8.24=3.5:3/8.24:3=5/8.8=5/64.

b) 2.14/7.8=2.2.7/7.2^3=2.7/7.4=1/2.

c) 3.7.11/22.9=3.7.1/12.11.3^2=7/2.3=76.

d)  8.5−8.2/16=(8.5−8.2):8/16:8=5−2/2=32.

e) 11.4−11/2−13=11.4−11/−11=(11.4−11):11/−11:11=4−1/−1=−3/1=-3

Answer 3

Rút gọn:

a) \frac{3900-15}{3120-12}=3120−123900−15​=

b) \frac{1620+12}{2025+15}=2025+151620+12​=