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a) \(\dfrac{7}{9}\times\dfrac{13}{25}\times\dfrac{9}{7}=\left(\dfrac{7}{9}\times\dfrac{9}{7}\right)\times\dfrac{13}{25}=1\times\dfrac{13}{25}=\dfrac{13}{25}\)
b) \(\dfrac{5}{9}\times\dfrac{21}{25}+\dfrac{21}{25}\times\dfrac{4}{9}\)
\(=\dfrac{21}{25}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)\)
\(=\dfrac{21}{25}\times1=\dfrac{21}{25}\)
c) \(\dfrac{19}{5}\times\dfrac{11}{16}-\dfrac{9}{5}\times\dfrac{11}{16}\)
\(=\dfrac{11}{16}\times\left(\dfrac{19}{5}-\dfrac{9}{5}\right)\)
\(=\dfrac{11}{16}\times2=\dfrac{22}{16}=\dfrac{11}{8}\)
a, 11 - ( 15 + 11 ) = x - ( 25 - 9 )
11-15-11=x-25+9
-15=x-16
x=1
b, 2 - x = 17 - ( - 5 )
2-x=22
x=-20
c, x - 12 = ( - 9 ) - 15
x-12=-24
x=-12
d, 9 - 25 = ( 7 - x ) - ( 25 + 7 )
(7-x)-32=-16
7-x=16
x=-9
#H
11 – (15 + 11) = x – (25 – 9)
11 -15 -11 = x – 16
-15 = x – 16
-15 + 16 = x
X = 1
11 - ( 15 + 11 ) = x - ( 25 - 9 )
11 - 26 = x - 16
- 15 = x - 16
- 15 + 16 = x
1 = x.
Nhớ tick mình nhé !
11-(15+11)=x-(25-9)
11-26 =x-(25-9)
-15 =x-(25-9)
-15 =x-16
16+(-15) =x
1 =x
\(11-\left(15+11-2.x\right)=x-\left(25-9\right)\)
\(11-15-11+2x=x-16\)
\(2x-x=-16-11+15+11\)
\(1x=-1\)
\(x=-1\)
11 - (15+11) = x - (25 - 9)
11-26=x-16
-15=x-15
x=-15+16
x=1
Hồ Thu Giang saj
a/ 11-(15+11)=x-(25-9)
-15=x-16
x=-15+16=1
tik nha bn hiền
<=> 11 - 26 = x - 16
<=> - 15 = x - 26
<=> x = - 15 + 26
=> x = 11