hospital

farmer

pretty

4G

\(=\dfrac{145\cdot100-143\cdot100}{100\cdot113-100\cdot112}=2\)

a) =\(\dfrac{21}{35}+\dfrac{10}{35}+\dfrac{4}{35}=\dfrac{21+10+4}{35}=\dfrac{35}{35}=1\)
b) =\(\dfrac{16}{24}+\dfrac{15}{24}-\dfrac{12}{24}=\dfrac{19}{24}\)
c) =\(\dfrac{35}{40}+\dfrac{80}{40}-\dfrac{24}{40}+\dfrac{120}{40}=\dfrac{35+80-24+120}{40}=\dfrac{211}{40}\)

Câu 1: D

Câu 2: Các phân số tối giản là \(\dfrac{1}{9};\dfrac{2}{11}\)

Câu 3: Phân số lớn nhất là \(\dfrac{17}{3}\)

Câu 4:

\(76m^28cm^2=760008cm^2\)

Câu 5:

Gọi số cần tìm là x

Theo đề, ta có: \(\dfrac{4}{7}=\dfrac{x}{21}\)

=>\(x=4\cdot\dfrac{21}{7}=4\cdot3=12\)

ĐỌC TIẾP CHO BÍT NHÉ

\(a,\dfrac{1}{2}\times\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{1}{6}-\dfrac{1}{8}=\dfrac{4}{24}-\dfrac{3}{24}=\dfrac{1}{24}\\ b,\dfrac{5}{2}:\dfrac{1}{4}-\dfrac{1}{8}=\dfrac{5}{2}\times4-\dfrac{1}{8}=10-\dfrac{1}{8}=\dfrac{80}{8}-\dfrac{1}{8}=\dfrac{79}{8}\)

a) 1/6- 1/8

= 1/24

b) 5/2 x 4/1-1/8

= 20/2 - 1/8

= 10-1/8

= 79/8

10

54567

\(\dfrac{12}{24}\)

\(\dfrac{3}{7}\)

\(a.x+\dfrac{3}{7}=\dfrac{2}{5}+\dfrac{3}{10}\)

\(x+\dfrac{3}{7}=\dfrac{7}{10}\)

\(x=\dfrac{7}{10}-\dfrac{3}{7}\)

\(x=\dfrac{19}{70}\)

\(b.\dfrac{19}{20}-x=\dfrac{8}{5}-\dfrac{3}{4}\)

\(\dfrac{19}{20}-x=\dfrac{17}{20}\)

\(x=\dfrac{19}{20}-\dfrac{17}{20}\)

\(x=\dfrac{2}{20}=\dfrac{1}{10}\)

\(c.\dfrac{7}{5}-\dfrac{x}{4}=\dfrac{13}{20}\)

\(x=\dfrac{7}{5}-\dfrac{13}{20}\)

\(x=\dfrac{15}{20}=\dfrac{3}{4}\)

=> Vậy x = 3

1.B

2.C

3. Thiếu

ĐÂY LÀ CÂU B , C D CỦA CÂU 3 

1.B

2.C

3.B