57 . 53
Ta đã biết 53 . 54 = 57. Hãy suy ra:
57 : 53 = ?; 57 : 54 = ?
57:53=1075471698
57:54=1055555556
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40 = ???
12 . 25 + 29 . 25 + 59 . 25 = ???
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57 = ???
12 . 53 + 53 . 172 - 53 = ???
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45 = ???
39 . 8 + 70 . 3 + 31 . 8 = ???
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= 2. 53 . 9 . 3 + 2. 3 .9 .87 - 3 .2 .9 .40
= 54.53+54.87-54.40
=54(53+87-40)
=54. 100=5400
12 . 25 + 29 . 25 + 59 . 25
= 25 . ( 12+29+59)
=25 . 90
=2250
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43.(37+93)+57(61+69)
=43.130+57.130
=130.(43+57)
=130.100
=13 000
12 . 53 + 53 . 172 - 53
=53(12+172-1)
=53.184
=9752
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
=35(54+58)+65(75+45)
=35.112+65.120
=3920+7800
=11720
39 . 8 + 70 . 3 + 31 . 8
=8(39+31)+70.3
=8.70+70.3
=70.(8+3)
=70.11
=770
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= ( 2 . 27 ) . 53 + ( 6 . 9 ) . 87 - ( 3 . 18 ) . 40
= 54 . 53 + 54 . 87 - 54 . 40
= 54(53+87-40)
= 5400
12 . 25 + 29 . 25 + 59 . 25
= 25( 12 + 29 + 59 )
= 2500
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43( 37 + 93 ) + 57(61 + 69 )
= 5590 + 7410
= 13000
12 . 53 + 53 . 172 - 53
= 53( 12 + 172 ) - 53
= 9752 - 53
= 9699
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
= 35( 54 + 58 ) + 65( 75 + 45 )
= 3920 + 7800
= 11720
(57-725)-(605-53)
\(\left(57-725\right)-\left(605-53\right)\)
\(=57-725-605+53\)
\(=\left(57+53\right)-\left(725+605\right)\)
\(=110-1330=-1220\)
(57−725)−(605−53)(57−725)−(605−53)
=57−725−605+53=57−725−605+53
=(57+53)−(725+605)=(57+53)−(725+605)
=110−1330=−1220
(57−725)−(605−53)
=57−725−605+53
=(57+53)−(725+605)
=110−1330
=−1220
c) 53 – 7x = 57 : 55
c) \(53-7x=57:55\Leftrightarrow53-7x=\dfrac{57}{55}\Leftrightarrow x=\dfrac{2858}{385}.\)
Tính:
5 3 + 2 5 = . . . 5 7 + 9 14 = . . .
(57-725)-(605-53)
phá ngoặc ta có
57 - 725 - 605 + 53
= -668 - 605 + 53
= -1273 + 53
=-1220
(57 - 725) - (605 - 53)
= -668 - 552
=-1220
(57-725)-(605-53)
(57-725)-(605-530
= -668 - 552
=-1220
nhớ tick nha!
(57-725)-(605-53)=
(-668)-552=
-1220
tick to nha ban nhe, tick to nha ban nhe, minh dung 1000% luon, tick to di
-72×17+31-36×228
Tìm x, biết:
a ) 2 5 . x + 1 3 = 1 5 b ) 4 9 − 5 3 . x = − 2 c ) 1 5 + 5 3 : x = 1 2 d ) 5 7 : x − 3 = − 2 7
Tính: a) 57. 53; b) 58:54
a) 57.53 = \(5^{7+3}\) = 510
b) 58:54 = 58−4 = 54
a, \(5^7.5^3=5^{7+3}=5^{10}\)
\(b,5^8:5^4=5^{8-4}=5^4\)
Tìm x, biết:
a ) 2 5 . x + 1 3 = 1 5 b ) 4 9 − 5 3 . x = − 2 ; c ) 1 5 + 5 3 : x = 1 2 d ) 5 7 : x − 3 = − 2 7
a ) x = 1 3 . b ) x = 22 15 . c ) x = 50 9 . d ) x = 5 19 .