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a) 12 + x = 16
=> x = 16 - 12
=> x = 4
b) 89 + 2x = 564
=> 2x = 564 - 89
=> 2x = 475
=> x = 237 ,5
a. 2x +4 (36-x) =100
2x + 144 - 4x = 100
144-100 = 4x - 2x
44=2x
44:2=x
22=x
b. 120 ( x - 9 ) = 90x + 60
120x - 1080 = 90x + 60
120x - 90x = 1080 - 60
30 x = 1020
x = 1020:30
x = 34
a) \(1+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\)
\(=\frac{16}{16}+\frac{4}{16}+\frac{2}{16}+\frac{1}{16}\)
\(=\frac{23}{16}\)
b) \(2-\frac{1}{8}-\frac{1}{12}-\frac{1}{16}\)
\(=\frac{96}{48}-\frac{6}{48}-\frac{4}{48}-\frac{3}{48}\)
\(=\frac{83}{48}\)
c) \(\frac{4}{99}\cdot\frac{18}{5}\div\frac{12}{11}+\frac{3}{5}\)
\(=\frac{4\cdot18\cdot11}{99\cdot5\cdot12}+\frac{3}{5}\)
\(=\frac{4\cdot9\cdot2\cdot11}{9\cdot11\cdot5\cdot4\cdot3}+\frac{3\cdot3}{3\cdot5}\)
\(=\frac{2}{15}+\frac{9}{15}=\frac{11}{15}\)
d) \(\left(1-\frac{3}{4}\right)\left(1+\frac{1}{3}\right)\div\left(1-\frac{1}{3}\right)\)
\(=\frac{1}{4}\cdot\frac{4}{3}\div\frac{2}{3}\)
\(=\frac{1\cdot4\cdot3}{4\cdot3\cdot2}=\frac{1}{2}\)
a)132:x=16
x=132:16
x=8,25
b)x:14,5=7,45
x=7,45x14,5
x=108,025
hok tốt nhé
\(a.=2,35\times\left(7+3\right)\)
\(=2,35\times10\)
\(=23,5\)
\(b.=6,75\times\left(12-2\right)\)
\(=6,75\times10\)
\(=67,5\)
\(c.=25\times4\times37,65\)
\(=100\times37,65\)
\(=3765\)
\(d.=20:2\times16,47\)
\(=10\times16,47\)
\(=164,7\)
\(a.X\times0,25=24,42-5,42\)
\(X\times0,25=19\)
\(X=19:0,25\)
\(X=76\)
\(b.X-5,3=5,65\times3,2\)
\(X-5,3=18,08\)
\(X=18,08+5,3\)
\(X=23,38\)
Tìm x :
a) x . 0,25 + 5,42 = 24,42
x . 0,25 = 24,42 - 5,42
x . 0,25 = 19
x = 19 : 0,25
x = 76
b) ( x - 5,3 ) : 4,2 = 5,65
( x - 5,3 ) = 5,65 . 4,2
x - 5,3 = 23,73
x = 23,73 + 5,3
x = 29,03
a)Ta có :
x-8,7=5 x 1,2 = 6
=> x = 6+8,7 = 14,7
Vậy x=14,7
b) Ta có
x+31/10=14,5+12/10=15,7
=> x=15,7-31/10=12,6.
Vậy x=12,6
a) ( x - 8,7 ) = 5 * 1,2
x - 8,7 = 6
x = 6 + 8,7
x = 14,7
b) x + 31/10 = 14,5 +12/10
\(a.=\frac{36}{5}\times\frac{7}{36}\)
\(=\frac{7}{5}\)
\(b.=\frac{31}{6}\times\frac{3}{1}\)
\(=\frac{31}{2}\)
Tìm x:
\(\left(x-\frac{2}{5}\right)\times5=\frac{5}{6}\)
\(x-\frac{2}{5}=\frac{5}{6}\times\frac{1}{5}\)
\(x-\frac{2}{5}=\frac{1}{6}\)
\(x=\frac{1}{6}+\frac{2}{5}\)
\(x=\frac{17}{30}\)
a,6,52
b,4,05
Tìm x:
a. x + 4,64 = 9,26 + 1,9
x + 4,64 = 11,16
x = 11,16 - 4,64
x = 6,52
b. 16 x x = 64,8
x = 64,8 : 16
x = 4,05