5/22+3/13−1/2trên 4/13−2/11+3/2
tính 2 cách
5/22+3/13−1/2trên 4/13−2/11+3/2
tính theo 2 cách
tính 2 cách
a)4/3/4+(−0,37)+1/8+(−1,28)+(−2,5)+3/1/2)
b)5/22+3/13−1/2trên 4/13−2/11+3/2
tính 2 cách
a)4/3/4+(−0,37)+1/8+(−1,28)+(−2,5)+3/1/2)
b)5/22+3/13−1/2trên 4/13−2/11+3/2
thầy cô giúp em giải bài này với ạ
tính 2 cách
a)4/3/4+(−0,37)+1/8+(−1,28)+(−2,5)+3/1/2)
b)5/22+3/13−1/2trên 4/13−2/11+3/2
mọi người giúp mk vs nha
Tính giá trị các biểu thức sau một cách hợp lí:
A = 5/11 . 5/7 + 5/11 . 2/7 + 6/11
B= 3/13 . 6/11 + 3/13 . 9/11 – 3/13 . 4/11
C= ( 12/16 – 31/22 + 14/91 ) . (1/2 – 1/3 – 1/6 )
Hãy giúp mk
\(A=\dfrac{5}{11}.\dfrac{5}{7}+\dfrac{5}{11}.\dfrac{2}{7}+\dfrac{6}{11}=\dfrac{5}{11}\left(\dfrac{5}{7}+\dfrac{2}{7}\right)+\dfrac{6}{11}=\dfrac{5}{11}.1+\dfrac{6}{11}=\dfrac{5}{11}+\dfrac{6}{11}=\dfrac{11}{11}=1\)
\(B=\dfrac{3}{13}.\dfrac{6}{11}+\dfrac{3}{13}.\dfrac{9}{11}-\dfrac{3}{13}.\dfrac{4}{11}=\dfrac{3}{13}\left(\dfrac{6}{11}+\dfrac{9}{11}-\dfrac{4}{11}\right)=\dfrac{3}{13}.1=\dfrac{3}{13}\)
\(C=\left(\dfrac{12}{16}-\dfrac{31}{22}+\dfrac{14}{91}\right)\left(\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{6}\right)=\left(\dfrac{12}{16}-\dfrac{31}{22}+\dfrac{14}{91}\right)\left(\dfrac{3}{6}-\dfrac{2}{6}-\dfrac{1}{6}\right)=\left(\dfrac{12}{16}-\dfrac{31}{22}+\dfrac{14}{91}\right).0=0\)
5/22+3/13-1/2
-------------------
4/13-2/11+3/2
tính 1 cách hợp lí
\(\frac{5}{4}\) \(+\) \(\frac{3}{13}\) \(-\) \(\frac{1}{2}\)
\(=\) \(\frac{77}{52}\) \(-\) \(\frac{1}{2}\)
\(=\) \(\frac{51}{52}\)
\(\frac{4}{13}\) \(-\) \(\frac{2}{11}\) \(+\) \(\frac{3}{2}\)
\(=\) \(\frac{18}{143}\) \(+\) \(\frac{3}{2}\)
\(=\) \(\frac{465}{286}\)
tính giá trị biểu thức sau bằng cách hợp lí
(5/4 + 3/4) . 4/7 + (3/4 + 9/4) . 4/7
-3/11 . (-22)/66 . 121/15
3/7 . 2/5 . 7/3 . 20 . 19/72
6/7 . 8/13 + 6/13 . 9/7 - 3/13 . 6/7
-1/4 . 152/11 + 68/4 . (-1)/11
-5/7 . 2/11 + (-5)/7 . 9/11 + 12/7
146/13 - (18/7 + 63/13)
cảm ơn
\(\frac{\frac{5}{22}+\frac{3}{13}-\frac{1}{2}}{\frac{4}{13}-\frac{2}{11}+\frac{3}{2}}\)
tính bằng 2 cách
tính bằng 2 cách
\(\frac{\frac{5}{22}+\frac{3}{13}-\frac{1}{2}}{\frac{4}{13}-\frac{2}{11}+\frac{3}{2}}\)