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a) 72/45 x 35/36= 8/5 x 35/36 =280/180=14/9.
b)1/2:3/4+1/6:3/4 =(1/2+1/6) : 3/4 =8/12:3/4 = 24/36=2/3
c) 2/3x4/5+1/3=2/3+1/3x4/5+1/3=4/3x4/15=16/45.
Nếu sai thông cảm cho mình nhé. Bạn ko k cũng ko sao đâu.
a) 1/2x(3/4+2/5)
1/2x23/20
23/40
b) 3/4:(8/9+16/3)
3/4:56/9
27/224
c) 1/5:1/10-1/3
2-1/3
5/3
d) 3/4x(20/9-8/15)
3/4x76/45
19/15
e) 1/7:5/14-3/2
=2/5-3/2
-11/10 ( Chị nghĩ lớp 4 chưa học đến số âm nên em xem lại đề nhé)
g) 3/2x(11/6-5/12)
3/2x17/12
17/8
a)\(\frac{1}{2}x\left(\frac{3}{4}+\frac{2}{5}\right)\)
\(=\frac{1}{2}x\left(\frac{15}{20}+\frac{8}{20}\right)\)
\(=\frac{1}{2}x\frac{23}{20}\)
\(=\frac{23}{40}\)
b)\(\frac{3}{4}:\left(\frac{8}{9}+\frac{16}{3}\right)\)
\(=\frac{3}{4}:\left(\frac{8}{9}+\frac{48}{9}\right)\)
\(=\frac{3}{4}:\frac{56}{9}\)
\(=\frac{3}{4}x\frac{9}{56}\)
\(=\frac{27}{224}\)
c) \(\frac{1}{5}:\frac{1}{10}-\frac{1}{3}\)
\(=\frac{1}{5}x10-\frac{1}{3}\)
\(=2-\frac{1}{3}\)
\(=\frac{6}{3}-\frac{1}{3}=\frac{5}{3}\)
d) \(\frac{3}{4}x\left(\frac{20}{9}-\frac{8}{15}\right)\)
\(=\frac{3}{4}x\left(\frac{100}{45}-\frac{24}{45}\right)\)
\(=\frac{3}{4}x\frac{76}{45}\)
\(=\frac{19}{5}\)
e) \(\frac{1}{7}:\frac{5}{14}-\frac{3}{2}\)
\(=\frac{1}{7}x\frac{14}{5}-\frac{3}{2}\)
\(=\frac{2}{5}-\frac{3}{2}\)
\(=\frac{4}{10}-\frac{15}{10}\)
\(=\frac{-11}{10}\)
g) \(\frac{3}{2}x\left(\frac{11}{6}-\frac{5}{12}\right)\)
\(=\frac{3}{2}x\left(\frac{22}{12}-\frac{5}{12}\right)\)
\(=\frac{3}{2}x\frac{17}{12}\)
=\(=\frac{17}{8}\)
12/15 + 37/7 + 16/5 + 5/7
= 4/5 + 37/7 + 16/5 + 5/7
= (4/5 + 16/5) + (37/7 + 5/7)
= 4 + 6
= 10
Chúc bạn học tốt.
😁😁😁
a) \(\dfrac{3}{7}\)
b)\(\dfrac{9}{4}\)
c)\(\dfrac{1}{3}\)
d)\(\dfrac{41}{32}\)
e)\(\dfrac{73}{60}\)
a) 7/12 + 5/24 + 5/12 + 19/24
= (7/12 + 5/12) + (5/24 + 19/24)
= 1 + 1
= 2
b) 5/18 + 4/15 + 7/18 + 1/15
= (5/18 + 7/18) + (4/15 + 1/15)
= 2/3 + 1/3
= 1
c) 1/5 + 5/9 + 4/5 + 1/9
= (1/5 + 4/5) + (5/9 + 1/9)
= 1 + 1/3
= 4/3
d) 1/3 + 1/6 + 4/3 + 2/6 + 2/3 + 5/6
= (1/3 + 4/3 + 2/3) + (1/6 + 1/6 + 5/6)
= 7/3 + 7/6
= 7/2
a) \(\dfrac{7}{12}+\dfrac{5}{24}+\dfrac{5}{12}+\dfrac{19}{24}\\ =\left(\dfrac{7}{12}+\dfrac{5}{12}\right)+\left(\dfrac{5}{24}+\dfrac{19}{24}\right)\\ =\dfrac{7+5}{12}+\dfrac{5+19}{24}\\ =\dfrac{12}{12}+\dfrac{24}{24}\\ =1+1=2\)
b) \(\dfrac{5}{18}+\dfrac{4}{15}+\dfrac{7}{18}+\dfrac{1}{15}\\ =\left(\dfrac{5}{18}+\dfrac{7}{18}\right)+\left(\dfrac{4}{15}+\dfrac{1}{15}\right)\\ =\dfrac{5+7}{18}+\dfrac{4+1}{15}\\ =\dfrac{12}{18}+\dfrac{5}{15}\\ =\dfrac{1}{3}+\dfrac{1}{3}=\dfrac{1+1}{3}=\dfrac{2}{3}\)