x:6*4=1,248
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x : 6 × 4 = 1 , 248
x : 6 = 1 , 248 : 4
x : 6 = 0 , 312
x = 0 , 312 × 6
x = 1 , 872
b) x : 5 − 8 , 6 = 0 , 4
x : 5 = 0 , 4 + 8 , 6
x : 5 = 9
x = 9 × 5
x = 45
![](https://rs.olm.vn/images/avt/0.png?1311)
a,\(\Rightarrow x:3=1,56+7,2\)
\(\Rightarrow x:3=8,76\)
\(\Rightarrow x=8,76\cdot3\)
\(\Rightarrow x=26,28\)
b,\(\Rightarrow x:6=1,248:4\)
\(\Rightarrow x:6=0,312\)
\(\Rightarrow x=0,312\cdot6\)
\(\Rightarrow x=1,872\)
c,(x+x+x+x+...+x)+(2+5+8+....+29)=165
10 số hạng 10 số hạng
\(\Rightarrow\)10x+(29+2)*10:2=165
\(\Rightarrow\)10x+155=165
\(\Rightarrow10x=165-155\)
\(\Rightarrow10x=10\)
\(\Rightarrow x=10:10\)
\(\Rightarrow x=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, X:6x4=1,248 =>X=1,248:4x6=1,872
b,7xX-2xX=1,85 =>5xX=1,85 =>X=1,85:5=0,37
c,Xx1000=499,7 =>X=499,7:1000=0,4997
d, 100xX=273,5 =>X=273,5:100=2,735
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( x - 3 ) x 5 = 21 Đáp án 7,2
b) 36 - 8 x x = 26 : đs 1,25
c) 3- 7,2 = 1,56 Đs ...
d) x / 6 x 4 = 1,248 ĐS 1.872
![](https://rs.olm.vn/images/avt/0.png?1311)
a)x : 3 - 7 * 2 = 1,56
x : 3 - 14 = 1,56
x : 3 = 1,56 + 14
x : 3 = 15,56
x = 15,56 * 3
x = 46,68
b)nếu dấu chấm trên đề là dấu phẩy thì:
x : 6,4 = 1,248
x = 1,248 * 6,4
x = 7,9872
c)(x + 1) + (x + 2) + (x + 3) + (x + 4) + (x + 5) = 40
x + 1 + x + 2 + x + 3 + x + 4 + x + 5 = 40
(x + x + x + x + x) + (1 + 2 + 3 + 4 + 5) = 40
5 * x + 15 = 40
5 * x = 40 - 15
5 * x = 25
x = 25 : 5
x = 5
A) X:3 - 7 * 2 = 1,56
X:3-14=1,56
X:3=1,56+14
X:3=5,56
X= 5,56* 3 =16,68
B) X : 6 . 4 = 1 ,248
X = 1,248 :4 *6
X=1,872
C) ĐỀ DÀI LÀM LUN
= 5X + (1+2+3+4+5) =40
5X+15 =40
5X= 40-15=25
X= 25:5=5
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2,5 x 8,7 x 4
= 8,7 x (2,5 x 4)
= 8,7 x 10
= 87
b) 2,735 + 1,248 + 3,265 + 4,752
= (2,735 + 3,265) + (1,248 + 4,752)
= 6 + 6 = 12
c) \(\dfrac{4}{13}\times\dfrac{2}{3}\times\dfrac{13}{4}\times\dfrac{3}{2}\)
\(=\dfrac{4}{13}\times\dfrac{13}{4}\times\dfrac{2}{3}\times\dfrac{3}{2}\)
\(=\dfrac{1}{1}\times\dfrac{1}{1}=\dfrac{1}{1}\)
a) 2,5 x 8,7 x 4
= 2,5 x 4 x 8,7
= 10 x 8,7
= 87
b) 2,735 + 1,248 + 3,265 + 4,752
= 2,735 + 3,265 + 1,248 + 4,752
= 6 + 6
= 12
c) \(\dfrac{4}{13}\times\dfrac{2}{3}\times\dfrac{13}{4}\times\dfrac{3}{2}\)
\(=\dfrac{4}{13}\times\dfrac{13}{4}\times\dfrac{2}{3}\times\dfrac{3}{2}\)
= 1 x 1
= 1
![](https://rs.olm.vn/images/avt/0.png?1311)
X : 6 x 4 = 1,248
X : 6 = 1,248 : 4
X : 6 = 0,321
X = 0,321 x 6 =1,926
X x 3 + X x 5 = 9,84
X x(3 + 5)=9,84
X x 8 = 9,84
X = 9,84 : 8 = 1,23
X x 1000 = 499,7
X = 499,7 : 1000 = 0,4997
100 x X = 273,5
X = 273,5 : 100 = 2,735
7 x X - 2 x X = 1, 85
X x(7 - 2)=1,85
X x 5 = 1,85
X = 1,8
x:6*4=1.248
=>x:6=1,248:4
=>x:6=0,312
=>x=0,312*6
=>x=1,872
Học giỏi nhá!
x:6*4=1.248
=>x:6=1,248:4
=>x:6=0,312
=>x=0,312*6
=>x=1,872
Học giỏi nhá!