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câu b trần nhật quỳnh tính sai rồi. Nhân chia trước cộng trừ sau mà
4\(\frac{1}{2}\)+\(\frac{1}{2}\): 5\(\frac{1}{2}\)
=\(\frac{9}{2}\)\(+\)\(\frac{1}{2}\)\(\div\)\(\frac{11}{2}\)
=\(\frac{9}{2}\)\(+\)\(\frac{1}{2}\)\(\times\)\(\frac{2}{11}\)
=\(\frac{9}{2}\)\(+\)\(\frac{1}{11}\)
=\(\frac{101}{22}\)
\(3\frac{1}{2}=\frac{7}{2};4\frac{5}{7}=\frac{33}{7};5\frac{5}{14}=\frac{75}{14}\)
\(3\frac{1}{2}+4\frac{5}{7}-5\frac{5}{14}\)
\(=\frac{7}{2}+\frac{33}{7}-\frac{75}{14}\)
\(=\frac{49}{14}+\frac{66}{14}-\frac{75}{14}\)
\(=\frac{115}{14}-\frac{75}{14}\)
\(=\frac{40}{14}=\frac{20}{7}\)
+) = \(\frac{20}{7}\)
+) = \(\frac{101}{22}\)
tk mik nha
mik khỏi chép lại đề
+) = \(\frac{7}{2}+\frac{33}{7}-\frac{75}{14}\)
= \(\frac{49}{14}+\frac{66}{14}-\frac{75}{14}\)
= \(\frac{115}{14}-\frac{75}{14}\)
= \(\frac{20}{7}\)
+) = \(\frac{9}{2}+\frac{1}{2}:\frac{11}{2}\)
= \(\frac{9}{2}+\frac{1}{2}\)x \(\frac{2}{11}\)
= \(\frac{9}{2}+\frac{1}{11}\)
= \(\frac{99}{22}+\frac{2}{22}\)
= \(\frac{101}{22}\)
tk nha b
3\(\frac{1}{2}\)+4\(\frac{5}{7}\)- 5\(\frac{5}{14}\)=
=\(\frac{7}{2}\)+\(\frac{33}{7}\)-\(\frac{65}{14}\)
=\(\frac{49}{14}\)+\(\frac{66}{14}\)-\(\frac{65}{14}\)
=\(\frac{50}{14}\)
a; 7/2+33/7-75/14=20/7
b: 9/2+1/2:11/2=9/2+1/11=101/22
a) MC :24
\(\frac{1}{3}+\frac{3}{8}-\frac{7}{12}=\frac{1\times8+3\times3-7\times2}{24}=\frac{3}{24}=\frac{1}{8}\)
b)MC : 56
\(\frac{3}{14}+\frac{5}{8}-\frac{1}{2}=\frac{3\times4+5\times7-1\times28}{56}=\frac{19}{56}\)
c) MC: 36
\(\frac{1}{4}-\frac{2}{3}-\frac{11}{18}=\frac{1\times9-2\times12-11\times2}{36}=\frac{-37}{36}\)
d) MC: 312
\(\frac{1}{4}+\frac{5}{12}-\frac{1}{13}-\frac{7}{8}=\frac{1\times78+5\times26-1\times24-7\times39}{312}=\frac{-89}{312}\)
1.
a) 5/8 x 4/10 + 2/3 =
= 1/4+ 2/3 = 11/12
b)5/12 x 4/7+5/12 x3/7
=5/12 x (4/7 +3/7)
=5/12 x1 = 5/12
c)(4/5 + 3/10 - 1/5 ) x 6 : 4/7
= ( 8/10 + 3/10 + 2/10) x 6 x 7/4
=13/10 x 21/2
=273/20
2.
5/8 và 3/2
ta có 5/8 =10/16 ; 3/2 =24 /16
vì 24 /16 >10 /16 nên 3/2 > 5/8
b. tương tự như câu a nha
c 418/417 và 925 /926
418/417 > 1 ; 925 /926 < 1
vì 418 /417 >1 mà 925/926 < 1 nên 418 / 417 > 925 /926
chúc bạn học tốt nha !
\(3\frac{1}{2}=\frac{7}{2};4\frac{5}{7}=\frac{33}{7}\)
\(3\frac{1}{2}+4\frac{5}{7}-\frac{5}{14}\)
\(=\frac{7}{2}+\frac{33}{7}-\frac{5}{14}\)
\(=\frac{49}{14}+\frac{66}{14}-\frac{5}{14}\)
\(=\frac{115}{14}-\frac{5}{14}\)
\(=\frac{110}{14}=\frac{55}{7}\)