Tính nhanh:
(-4/5+4/3) + (-5/4+14/5)-7/3
1 tính nhanh
(-4/5+4/3)+(-5/4+14/5)-7/3
4/19.-3/7+-3/7.15/19+5/7
Tính nhanh giá trị biểu thức:
A = (5/8 - 5/14) : 4/7 + (3/8 - 9/14) : 4/7
|(5/8-5/14)+(3/8-9/14)|:4/7
=|(5/8+3/8)+(-5/14-9/14)|:4/7
=|1+(-1)|:4/7
=0
`A = ( 5 / 8 - 5 / 14 ) : 4 / 7 + ( 3 / 8 - 9 / 14 ) : 4 / 7`
`A = ( 5 / 8 - 5 / 14 + 3 / 8 - 9 / 14 ) : 4 / 7`
`A = [ ( 5 / 8 + 3 / 8 ) - ( 5 / 14 + 9 / 14 ) ] . 7 / 4`
`A = ( 8 / 8 - 14 / 14 ) . 7 / 4`
`A = ( 1 - 1 ) . 7 / 4 = 0 . 7 / 4 = 0`
\(A=\left(\dfrac{5}{8}-\dfrac{5}{14}\right)\times\dfrac{7}{4}+\left(\dfrac{3}{8}-\dfrac{9}{14}\right)\times\dfrac{7}{4}\)
\(A=\left(\dfrac{5}{8}-\dfrac{5}{14}+\dfrac{3}{8}-\dfrac{9}{14}\right)\times\dfrac{7}{4}\)
\(A=\left(1-1\right)\times\dfrac{7}{4}=0\)
tính nhanh:4/5 nhân 3/7 cộng 4/5 nhân 6/7 trừ 4/5 nhân 4/14
\(\frac{4}{5}.\frac{3}{7}+\frac{4}{5}.\frac{6}{7}-\frac{4}{5}.\frac{4}{14}\)
\(=\frac{4}{5}.\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)
\(=\frac{4}{5}.1\)
\(=\frac{4}{5}\)
\(\frac{4}{5}\times\frac{3}{7}+\frac{4}{5}\times\frac{6}{7}-\frac{4}{5}\times\frac{4}{14}\)
\(=\frac{4}{5}\times\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)
\(=\frac{4}{5}\times1\)
\(=\frac{4}{5}\)
\(\frac{4}{5}\times\frac{3}{7}+\frac{4}{5}\times\frac{6}{7}-\frac{4}{5}\times\frac{4}{14}.\)
\(=\frac{4}{5}\times\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)
\(=\frac{4}{5}\times\left(\frac{3}{7}+\frac{6}{7}-\frac{2}{7}\right)\)
\(=\frac{4}{5}\times\frac{7}{7}\)
\(=\frac{4}{5}\times1\)
\(=\frac{4}{5}\)
Tính nhanh
4/5 × 3/7 + 4/5 × 6/7 - 4/5 × 4/14
Làm rõ ai nhanh mik tik
\(\frac{4}{5}.\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)=\frac{4}{5}.1=\frac{4}{5}\)
Tính nhanh:
a, 1/3 . 4/5 + 1/3 * 6/5 - 4/3
b, [ -4/5 + 4/3 ] - [ -5/4 + 14/5 + 7/3]
Giải giúp mình nha . Ai nhanh mà đúng thì mình tick.
Tính nhanh
a,3/4 : ( 1/7_ 5/14) + 3/4: ( 1/2 _ 1/-3)
b,5/7 . 5/11 + 5/7 . 2/11 _ 5/7 . 14/11
Mn ơi cho mình hỏi tick kiểu gì ạ mình mới dùng web này nên ko biết
Giải giúp mình ha. Ai nhanh mà đubgs mình tick 5 cái luôn
Tính nhanh
a,3/4 : ( 1/7_ 5/14) + 3/4: ( 1/2 _ 1/-3)
b,5/7 . 5/11 + 5/7 . 2/11 _ 5/7 . 14/11
GẤP!
(-4/5 + 2/3) + (-5/4 + 14/5) + (7/3 - 2) Tính nhanh ạ (em trên điện thoại k gõ đc)
( - \(\dfrac{4}{5}\) + \(\dfrac{2}{3}\)) + ( - \(\dfrac{5}{4}\) + \(\dfrac{14}{5}\) ) + ( \(\dfrac{7}{3}\) - 2)
= - \(\dfrac{4}{5}\) + \(\dfrac{2}{3}\) - \(\dfrac{5}{4}\) + \(\dfrac{14}{5}\) + \(\dfrac{7}{3}\) - 2
= ( \(\dfrac{14}{5}\) - \(\dfrac{4}{5}\)) + ( \(\dfrac{2}{3}\) + \(\dfrac{7}{3}\)) - \(\dfrac{5}{4}\) - 2
= \(\) 2 + 3 - \(\dfrac{5}{4}\) - 2
= ( 2 - 2) + ( 3 - \(\dfrac{5}{4}\))
= \(\dfrac{7}{4}\)
Tính nhanh
A)-3/7+5/13-4/7+8/13
B)-5/14-2/-14+1/8+1/8
C)-5/13-(3/5+3/13-4/10)
D)[1/8-9/7+4/6-12/7-1/2)+5/9]
a, \(\frac{-3}{7}+\frac{5}{13}-\frac{4}{7}+\frac{8}{13}\)
\(=\frac{-3}{7}-\frac{4}{7}+\frac{5}{13}+\frac{8}{13}\)
\(=-\frac{7}{7}+\frac{13}{13}=-1+1=0\)
b, \(\frac{-5}{14}-\frac{2}{-14}+\frac{1}{8}+\frac{1}{8}\)
\(=\frac{-5}{14}+\frac{2}{14}+\frac{1}{8}+\frac{1}{8}\)
\(=-\frac{3}{14}+\frac{1}{4}=\frac{1}{28}\)
c,\(-\frac{5}{13}-\left(\frac{3}{5}+\frac{3}{13}-\frac{4}{10}\right)\)
\(=-\frac{5}{13}-\frac{3}{13}-\frac{3}{5}+\frac{4}{10}\)
\(=-\frac{8}{13}-\frac{3}{5}+\frac{4}{10}=-\frac{79}{65}+\frac{4}{10}=-\frac{53}{65}\)
d, \(\left[\left(\frac{1}{8}-\frac{9}{7}+\frac{4}{6}-\frac{12}{7}-\frac{1}{2}\right)+\frac{5}{9}\right]\)
\(=\left[\left(\frac{1}{8}-\frac{9}{7}+\frac{2}{3}-\frac{12}{7}-\frac{1}{2}\right)+\frac{5}{9}\right]\)
\(=\left[\left(\frac{1}{8}-\frac{1}{2}-\frac{9}{7}-\frac{12}{7}+\frac{2}{3}\right)+\frac{5}{9}\right]\)
\(=-\frac{65}{24}+\frac{5}{9}=-2\frac{11}{72}\)