2000 : 25 = (2000 * 4) : (25 * 4) = 8000 : 100 = 80

7300 : 50 = (7300 * 2) : (50 * 2) = 14600 : 100 = 146

4970 : 50 = (4970 * 2) : ( 50 * 2) = 9940 : 100 = 99,4

81000 : 25 = (81000 * 4) : (25 * 4) = 324000 : 100 = 3240

2000: 25 = (2000 x 2 ) : ( 25 x 2 ) = 4000 : 50 = 80

7300 x 50 = ( 7300 x 2 ) : ( 50 x 2 ) =14600 : 100 = 146

4970 : 5 =  ( 4970 x 2 ) : ( 5 x2 ) = 9940 : 10 = 994

81000 : 25 = ( 81000 x 2 ) : ( 25 x 2 ) = 162000 : 50 = 3240

66\(\times\)50=3300

72\(\times\)125=9000

38\(\times\)5=190

2000\(\div\)=80

7300\(\div\)50=146

4970\(\div\)5=994

81000\(\div\)648

Học tốt!

Tính nhẩm

a) 66.50 = 3300

b) 72.125 = 9000

c) 38.5 = 190

d) 2000:25 = 80

e) 7300:50 = 146

g) 4970:5 = 994

h) 81000:125 = 648

Các bạn viết cả bước làm cho mk nha

a, 499.12

=499.(10+2)

=499.10+499.2

=4990+998

=5988

499.12 = 5988

7300 : 50 = 146

204 : 12 = 17

601.42 = 25242

4970 : 5 = 994

199.41 = 8159

A

A

A

4970 : 5 =994

66.50=3300

2000:25=80

38:5=7,6

a: \(=3\sqrt{5}+2\sqrt{5}-2\sqrt{5}=3\sqrt{5}\)

b: \(=2\sqrt{2}+2\sqrt{2}+5\sqrt{2}=9\sqrt{2}\)

c: \(=4\sqrt{3}+3\sqrt{3}-3\sqrt{5}+2\sqrt{5}=7\sqrt{3}-\sqrt{5}\)

d: \(=5\sqrt{3}+4\sqrt{3}-10\sqrt{3}=-\sqrt{3}\)

e: \(=\left(\sqrt{7}-2\sqrt{3}\right)\cdot\sqrt{7}+2\sqrt{21}\)

=7-2*căn 21+2*căn 21

=7

f: \(=\left(2\sqrt{11}-3\sqrt{2}\right)\cdot\sqrt{11}+3\sqrt{22}\)

=22-3*căn 22+3*căn 22

=22

a) \(3\sqrt{5}+\sqrt{20}-2\sqrt{5}\)

\(=3\sqrt{5}+2\sqrt{5}-2\sqrt{5}\)

\(=3\sqrt{5}\)

b) \(2\sqrt{2}+\sqrt{8}+\sqrt{50}\)

\(=2\sqrt{2}+2\sqrt{2}+5\sqrt{2}\)

\(=9\sqrt{5}\)

c) \(4\sqrt{3}+\sqrt{27}-\sqrt{45}+2\sqrt{5}\)

\(=4\sqrt{3}+3\sqrt{3}-3\sqrt{5}+2\sqrt{5}\)

\(=7\sqrt{3}-\sqrt{5}\)

d) \(\sqrt{75}+\sqrt{48}-\sqrt{300}\)

\(=5\sqrt{3}+4\sqrt{3}-10\sqrt{3}\)

\(=-\sqrt{3}\)

e) \(\left(\sqrt{28}-\sqrt{12}-\sqrt{7}\right)\sqrt{7}+2\sqrt{21}\)

\(=\left(2\sqrt{7}-2\sqrt{3}-\sqrt{7}\right)\sqrt{7}+2\sqrt{21}\)

\(=\left(\sqrt{7}-2\sqrt{3}\right)\sqrt{7}+2\sqrt{21}\)

\(=7-2\sqrt{21}+2\sqrt{21}\)

\(=7\)

f) \(\left(\sqrt{99}-\sqrt{18}-\sqrt{11}\right)\sqrt{11}+3\sqrt{22}\)

\(=\left(3\sqrt{11}-3\sqrt{2}-\sqrt{11}\right)\sqrt{11}+3\sqrt{22}\)

\(=\left(2\sqrt{11}-3\sqrt{2}\right)\sqrt{11}+3\sqrt{22}\)

\(=22-3\sqrt{22}+3\sqrt{22}\)

\(=22\)

g) \(3\sqrt{45}-5\sqrt{125x}+7\sqrt{20x}+28\)

\(=9\sqrt{5}-25\sqrt{5x}+14\sqrt{5x}+28\)

\(=9\sqrt{5}-11\sqrt{5x}+28\)

\(\text{a) -3000 : 2 + 5(2x-1) = 125}\\ -1500+5\left(2x-1\right)=125\\ 5\left(2x-1\right)=125-\left(-1500\right)\\ 5\left(2x-1\right)=1625\\ 2x-1=1625:5\\ 2x-1=325\\ 2x=325+1\\ 2x=326\\ x=326:2\\ x=163\)

\(\text{b) 6x -12 = -18}\\ 6x=-16+12\\ 6x=-6\\ x=-1\)

\(\text{c) 17 + 3(x-1) = 5}\\ 3\left(x-1\right)=5-17\\ 3\left(x-1\right)=-12\\ x-1=-12:3\\ x-1=-4\\ x=-3\)

a)b) đợi tí hơi dài đấy

c) 2000 : 25

= 20 . 100 : 25

= 20 . 4

= 80

d) 7300 : 50

= 73 . 100 : 50

= 73 . 2

= 146

Tính nhanh :

a) 1 + 3 + 5 + ... + ( 2n - 1 )

= [  ( 2n - 1 ) - 1 ] : 2 

= n 

b) 2 + 4 + 6 + 8 + ... + 2n

= ( 2n-2) : 2

= n-1

c) 2000 : 25

= 80

d) 7300 : 50

= 146

a)

SSH là :

[ ( 2n - 1 ) - 1 ] : 2 + 1

= [ 2n - 1 - 1 ] : 2 + 1

= [ 2n - 2 ] : 2 + 1

= 2 ( n - 1 ) : 2 + 1

= n - 1 + 1

= n

Tổng là :

[ ( 2n-1 ) + 1 ] . n : 2

= [ 2n - 1 + 1 ] . n : 2

= 2n . n : 2

= 2n^2 : 2

= n^2