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4,22 < 4,29; 4,39; 4,49; 4,59; 4,69; 4,79; 4,89; 4,99
Vậy có 8 giá trị của x
HT
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4,22 < 4,x9 < 4,63
=> 4,22 < 4,39 ; 4,49 ; 4,59 < 4,63
=> x = { 3 , 4 , 5 }
B1 tính giá trị biểu thức
15/7-2/5x9/4
B2 tìm x
A :x :0,01=476,29+134,81
B:x nhân 4,8=161,2-38,8
![](https://rs.olm.vn/images/avt/0.png?1311)
#)Giải :
Bài 1 :
\(\frac{15}{7}-\frac{2}{5}x\frac{9}{4}\)
= \(\frac{15}{7}-\frac{9}{10}\)
=\(\frac{87}{70}\)
Bài 2 :
A; X : 0,01 = 476,29 + 134,81
X : 0,01 = 611,1
X = 611,1 : 0,01
X = 61110
B; X x 4,8 = 161,2 - 38,8
X x 4,8 = 122,4
X = 122,4 : 4,8
X = 25,5
#)Chúc bn học tốt :D
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11(6-x)-4x=11
=>66-11x-4x=11
=>66-15x=11
=>15x=66-11=55
=>\(x=\dfrac{55}{15}=\dfrac{11}{3}\)
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a) \(...\Rightarrow x.\left(2+5\right)=14\Rightarrow x.7=14\Rightarrow x=14:7=2\)
b) \(...\Rightarrow x.\left(9+1\right)=20\Rightarrow x.10=20\Rightarrow x=20:10=2\)
c) \(...\Rightarrow x.\left(\dfrac{2}{3}+\dfrac{1}{3}\right)=1999\Rightarrow x.\dfrac{3}{3}=1999\Rightarrow x=1999\)
d) \(...\Rightarrow11.x+22=5.x+40\Rightarrow11.x-5.x=40-22\Rightarrow6.x=18\Rightarrow x=18:6=3\)
e) \(...\Rightarrow11.x-66=4.x+11\Rightarrow11.x-4.x=11+66\Rightarrow7.x=77\Rightarrow x=77:7=11\)
f) \(...\Rightarrow\left(3.x-12\right):x=12-10\)
\(\Rightarrow3.x-12=2.x\)
\(\Rightarrow3.x-2.x=12\)
\(\Rightarrow x=12\)
g) \(...\Rightarrow\left(5.x+7\right):x=26-20\)
\(\Rightarrow5.x+7=6.x\)
\(\Rightarrow6.x-5.x=7\)
\(\Rightarrow x=7\)
h) \(...\Rightarrow x.\left(1999-1\right)=1999.\left(1997+1\right)\)
\(\Rightarrow x.1998=1999.1998\)
\(\Rightarrow x=1999.1998:1998\)
\(\Rightarrow x=1999\)
a, \(x\times\) 2 + \(x\times\) 5 = 14
\(x\) \(\times\) ( 2 + 5) = 14
\(x\) \(\times\) 7 = 14
\(x\) = 14: 7
\(x\) = 2
b, \(x\times9\) + \(x\)= 20
\(x\) \(\times\)( 9 + 1) = 20
\(x\) \(\times\) 10 = 20
\(x\) = 2
c, \(x\) : \(\dfrac{3}{2}\) + \(x\times\dfrac{1}{3}\) = 1999
\(x\times\) \(\dfrac{2}{3}\) + \(x\) \(\times\dfrac{1}{3}\) = 1999
\(x\times\) ( \(\dfrac{2}{3}\) + \(\dfrac{1}{3}\)) = 1999
\(x\) = 1999
d, 11\(\times\)(\(x+2\)) = 5 \(\times\) \(x\) + 40
11 \(\times\) \(x\) + 22 = 5 \(\times\) \(x\) + 40
11 \(\times\) \(x\) = 5 \(\times\) \(x\) + 40 - 22
11 \(\times\) \(x\) = 5 \(\times\) \(x\) + 18
11 \(\times\) \(x\) - 5 \(\times\) \(x\) = 18
\(x\) \(\times\) ( 11 - 5) = 18
\(x\) \(\times\) 6 = 18
\(x\) = 3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(11\times\left(x-5\right)=5\times x+11\)
\(11\times x-55=5\times x+11\)
\(11\times x-5\times x=11+55\)
\(6\times x=66\)
\(x=11\)
![](https://rs.olm.vn/images/avt/0.png?1311)
11 x ( X - 6 ) = 4 x X + 11
11 x X - 11 x 6 = 4 x X + 11
11 x X - 66 = 4 x X + 11
\(\Rightarrow\)X x ( 11 - 4 ) = 66 - 11
X x 6 = 55
x = 55 : 6
x = 55 /6
3,027 × 38,8 + 4,22 × 60,54 + 11 × 6,054 - 6,054
= 3,027 × 2 × 19,4 + 4,22 × 10 × 6,054 + 11 × 6,054 - 6,054 × 1
= 6,054 × 19,4 + 42,2 × 6,054 + 11 × 6,054 - 6,054 × 1
= 6,054 × (19,4 + 42,2 + 11 - 1)
= 6,054 × 71,6
= 433,4664