2007 + 2007 + 2007 + 2007 x 4 = 14049

2007 + 2007 + 2007 + 2007 x 4 = 14049 bạn nha . 

2007+2007+2007+2007 x 4

= 2007 x 3+2007 x 4

= 2007 x (3+4)

= 2007 x 7

= 14049

\(2007+2007+2007+2007\times4\)

\(=2007\times3+2007\times4\)

\(=2007\times\left(3+4\right)\)

\(=2007\times7\)

\(=14049\)

a) Ta có (14 – 4) x 3 = 14 x 3 – 4 x 3

b) 29 x 2 – 9 x 2 = (29 – 9) x 2

                         = 20 x 2

                         = 40

7 x 214 – 7 x 14 = 7 x (214 – 14)

                          = 7 x 200

                          = 1 400

250 nhân 4 là 1000 nhân tiếp với 2007 là 2,007,000

cảm ơn bạn nhé

(14 x 14 - X - 16) : 4 =148 : 4

(14 x 14 - 16- X) : 4  = 37

(          180 - X ) : 4  =37

                   180 - X =37 x 4

                   180 - X =148

                           X =180 - 148

                           X =32

(14 x14- X-16):4=148:4

14 x14 -X-16=148

196-X-16      =148

180-X           =148

X=180-148

x=32

a: \(=\dfrac{\left(\dfrac{1}{2}:\dfrac{1}{2}-\dfrac{1}{4}:\dfrac{1}{4}+\dfrac{1}{8}:\dfrac{1}{8}-\dfrac{1}{10}:\dfrac{1}{10}\right)}{1+2+3+...+2008}\)

=0

c: =8,1*5/3*1875+13,5*625

=13,5(1875+625)

=13,5*2500

=33750

\(a.=\dfrac{2019}{2020}\times\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\\ =\dfrac{2019}{2020}\times1=\dfrac{2019}{2020}\\ b.=\dfrac{25}{27}\times\left(\dfrac{17}{14}-\dfrac{1}{14}-\dfrac{2}{14}\right)\\ =\dfrac{25}{27}\times1=\dfrac{25}{27}\)

1, \(14:x+6=8\)

\(14:x=8-6=2\)

\(x=14:2=6\)

2, \(x:\frac{1}{4}\cdot5=50\)

\(x:\frac{1}{4}=50:5=10\)

\(x=10\cdot\frac{1}{4}=2,5\)

3, \(x:\frac{7}{3}+4=16\)

\(x:\frac{7}{3}=16-4=12\)

\(x=12\cdot\frac{7}{3}=28\)

4, \(24-x\cdot\frac{1}{3}=14\)

\(x\cdot\frac{1}{3}=24-14=10\)

\(x=10:\frac{1}{3}=0,3\)

TK MK NHA. CÂU CUỐI MK KO LÀM ĐÂU. ^_^