19+x=20
34-x=50
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\(\dfrac{18}{31}\times\dfrac{62}{9}\)
\(=\dfrac{18\times62}{31\times9}\)
\(=\dfrac{2\times2}{1}\)
\(=4\)
==============
\(\dfrac{35}{72}\times\dfrac{63}{20}\)
\(=\dfrac{35\times63}{72\times20}\)
\(=\dfrac{7\times7}{8\times4}\)
\(=\dfrac{49}{32}\)
===============
\(\dfrac{34}{65}:\dfrac{17}{15}\)
\(=\dfrac{34}{65}\times\dfrac{15}{17}\)
\(=\dfrac{34\times15}{65\times17}\)
\(=\dfrac{2\times3}{13\times1}\)
\(=\dfrac{6}{13}\)
===========
\(\dfrac{111}{64}:\dfrac{37}{40}\)
\(=\dfrac{111}{64}\times\dfrac{40}{37}\)
\(=\dfrac{111\times40}{64\times37}\)
\(=\dfrac{3\times5}{8\times1}\)
\(=\dfrac{15}{8}\)
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\(\dfrac{12}{19}\times\dfrac{41}{52}:\dfrac{82}{19}\)
\(=\dfrac{12}{19}\times\dfrac{41}{52}\times\dfrac{19}{82}\)
\(=\dfrac{12\times41\times19}{19\times52\times82}\)
\(=\dfrac{3\times1\times1}{1\times13\times2}\)
\(=\dfrac{3}{26}\)
\(\frac{21.19+19.79}{38.50}\)
\(=\frac{19.\left(21+79\right)}{38.50}\)
\(=\frac{19.100}{38.50}\)
\(=\frac{19.2.50}{19.2.50}\)
\(=1\)
3,6 \(\times\) 62 + 7,2 \(\times\) 19 + 7,2 \(\times\) 50
= 3,6 \(\times\) 2 \(\times\) 31 + 7,2 \(\times\) 19 + 7,2 \(\times\) 50
= 7,2 \(\times\) 31 + 7,2 \(\times\) 19 + 7,2 \(\times\) 50
= 7,2 \(\times\) ( 31 + 19 + 50)
= 7,2 \(\times\) 100
= 720
19 + ( x - 23 ) = 50
x - 23 = 50 - 19
x - 23 = 31
x = 31 + 23
x = 54
nha bn
a) x+19=29
x = 29 - 19
x = 10
Vậy x = 10
b)x-37=50
x = 50 + 37
x = 87
Vậy x = 87
# HOK TỐT #
\(\text{a) x+19=29}\)
\(x=29-19\)
\(x=10\)
\(\text{b)x-37=50}\)
\(x=50+37\)
\(x=87\)
học tốt
-11-(19-x)=50
=> -11 -19+x=50
=> -30+x=50
x=-30-50
x=-80
k cho mh nha
mh trả lời đầu tiên
\(a.13.\left(78+22\right)=13.100=1300\)
\(b.25.70+28.25+25.2=25.\left(70+28+2\right)=25.100=2500\)
\(c.\dfrac{15.3.14.2.19}{19.14.15}=6\)
\(d.\dfrac{132.70.60}{12.35.20}=\dfrac{11.12.35.2.20.3}{12.35.20}=66\)
You can enjoy the food you have but you shouldn't eat too much
Không linh tinh mà là rất linh tinh (vì đây là Online Math, không phải Online English).