X x 4 + X x 5 = 45 5 x X - X = 32
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) 2 x 6 = 12 3 x 7 = 21
12 : 2 = 6 21 : 3 = 7
12 : 6 = 2 21 : 7 = 3
4 x 8 = 32 5 x 9 = 45
32 : 4 = 8 45 : 5 = 9
32 : 8 = 4 45 : 9 = 5
b) 600 : 3 = 200 800 : 4 = 200 400 : 2 = 200
600 : 2 = 300 800 : 2 = 400 500 : 5 = 100
a) 2x6=12 3x7=21
12:2=6 21:3=7
12:6=2 21:7=3
4x8=32 5x9=45
32:4=8 45:5=9
32:8=4 45:9=5
b) 600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100
A Legend Never Dies
Tính:
5 x 6 =30
63 : 9 =7
7 x 4 =28
45 : 5 =5
6 x 7 =42
32 : 8 =4
8 x 9 =72
35 : 7 =5
bài 2 tìm x
a,106- ( x+ 7) =9
x+7 = 106 - 9
x+7 = 107
x= 107 - 7
x=100
b, 2 x ( x+ 4) + 5 =65
2 x (x+4) = 65 - 5
2 x (x+4) = 60
x+4 = 60:2
x+4= 30
x= 30 - 4
x=26
c, (16x x -32) x 45=0
16 x X - 32 = 0: 45
16 x X - 32 =0
16 x X = 0 + 32
16 x X = 32
X= 32:16
X=2
d, x+4 x x = 100 : 5
X + 4 x X = 20
(1+4) x X = 20
5 x X = 20
X= 20:5
X=4
(82 - 5.x) : 13 - 4 = 0
(82 - 5.x) : 13 = 0 + 4
(82 - 5.x) : 13 = 4
(82 - 5.x) = 4 . 13
(82 - 5.x) = 52
5.x = 82 - 52
5.x = 30
x = 30 : 5 = 6
(32 . 45) : 2 = (x + 70) : 14 - 40
720 = (x + 70) : 14 - 40
(x + 70) : 14 = 720 + 40
(x + 70) : 14 = 760
(x + 70) = 760 . 14
(x + 70) = 10640
x = 10640 - 70
x = 10570
\(a.-14-x=-8\)
\(x=-6\)
\(b.11+x+20=32\)
\(31+x=32\)
\(x=1\)
\(c.5-\left(x-8\right)=63\)
\(x-8=-58\)
\(x=-50\)
a,\(\left(-14-x\right)+13=5\)
\(\Rightarrow-x+1=5\)
\(\Rightarrow-x=4\)
\(\Rightarrow x=-4\)
b,\(\left(11+x\right)-\left(-11-9\right)=32\)
\(\Rightarrow11+x+11+9=32\)
\(\Rightarrow x+31=32\)
\(\Rightarrow x=1\)
c,\(5-\left(x-8\right)+\left(-21\right)=42\)
\(\Rightarrow5-x+8-21=42\)
\(\Rightarrow-x-8=42\)
\(\Rightarrow x=-50\)
b)
\(\dfrac{1}{2}\left(\dfrac{4}{5}-\dfrac{3}{2}\right)+x=5\left(x-\dfrac{1}{3}\right)\)
=> \(-\dfrac{7}{20}+x=5x-\dfrac{5}{3}\)
=> \(\dfrac{79}{60}=4x\)
=> \(\dfrac{79}{240}=x\)
Vậy \(\dfrac{79}{240}=x\)
c)
\(2\left(x-5\right)-3\left(x+7\right)=14\)
=> \(2x-10-3x-21=14\)
=> \(-x-31=14\)
=> \(-x=45\)
=> x = -45
Vậy x là -45
X x 4 + X x 5 = 45
X x (4 + 5) = 45
X x 9 = 45
X = 45 : 9
X = 5
5 x X - X = 32
X x (5 - 1) = 32
X x 4 = 32
X = 32 : 4
X = 8
x * 4 + x * 5 = 45 5 * x - x = 32
x * (4+5) = 45 5 * x - x * 1 = 32
x * 9 = 45 x * (5 - 1) = 32
x = 45 : 9 x * 4 = 32
x = 5 x = 32 : 4
x = 8
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