25 × X - X = 14040 : 45
25*X-X=14040/45
25* x- x=14040:45
25x-x=312
24x=312
x=312:24
x=13
25* x- x=14040:45
25x-x=312
24x=312
x=312:24
x=13
25 x y - y = 14040 : 45
X × 25 + x × 74 + x = 200
25 × x - x = 14040 : 45
x : 55 = 14,3
X × 25 + x × 74 + x = 200
=> X x (25 + 74 + 1) = 200
=> X x 100 = 200
=> x = 2
25 x X - X = 14040 : 45
=> X x (25 - 1) = 312
=> X x 24 = 312
=> X = 13
X : 55 = 14,3
=> X = 14,3 x 55
=> X = 786,5
Tìm Y biết 25 x Y- Y=14040:45
25* x- x=14040:45
x*2=15-x*3
giúp mình trả lời hai câu hỏi này nhé !
a)25* x- x=14040:45
25x-x=312
24x=312
x=312:24
x=13
b)x*2=15-x*3
2x=15-3x
2x+3x=15
5x=15
x=15:5
x=3
a)25* x- x=14040:45
25x - x=312
24x = 312
x=312:24
x=13
b)x*2=15-x*3
2x=15-3x
2x+3x=15
5x=15
x=15:5
x=3
25xy-y=14040:45
\(đk:x\inℕ^∗\)
\(25xy-y=\frac{14040}{45}\)
\(\Rightarrow y\left(25x-1\right)=312\)
dựa vào cách giải phương trình ước số mà tìm nha bạn!
( 2746 - x ) - 258 = 1360
25 × x - x = 14040 : 45
x : 1/2 + x : 1/7 + x : 1/3 = 864
( 5915 + 3550 : 25 ) - 76 × 25
7 × 2/3 - 2/5 : 1/2 - 2/3
1\(\frac{2}{3}\): \(\frac{2}{3}\)- \(\frac{3}{4}\)× \(\frac{2}{3}\)+ 5\(\frac{3}{7}\)
1\(\frac{1}{3}\)+ 1\(\frac{1}{4}\): 1 \(\frac{1}{2}\)+ 2\(\frac{3}{4}\)× 2\(\frac{2}{3}\)
\(\left(2746-x\right)-258=1360\)
\(2746-x=1360+258\)
\(2746-x=1618\)
\(x=2746-1618\Rightarrow x=1128\)
1 : Tính nhanh:
a, 2376 + 3425 - 376 - 425
b, 4638 - 2437 + 5362 - 7563
c, 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15
d, 4 x 125 x 25 x 8
e, 2 x 8 x 50 x 25 x 125
2 : Tính nhanh bằng hai cách:
125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
1 : Tính nhanh:
a) 2376 + 3425 - 376 - 425 = ( 2376 - 376 ) + ( 3425 - 425 )
= 2000 + 3000
= 5000
b)4638 - 2437 + 5362 - 7563 = 2210 + ( - 2210 )
= 0
c) 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15
= 45 x 4 + 15 x 4
= ( 45 + 15 ) x 4
= 60 x 4
= 240
d) 4 x 125 x 25 x 8 = ( 4 x 25 ) x ( 125 x 8 )
= 100 x 1000
= 100000
e) 2 x 8 x 50 x 25 x 125 = ( 2 x 50 ) x ( 8 x 125 ) x 25
= 100 x 1000 x 25
= 100000 x 25
= 2500000
2 : Tính nhanh bằng 2 cách:
C1 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
= ( 125 - 25 ) + ( 125 - 25) + ( 125 - 25 ) + ( 125 - 25 )
=100 + 100 + 100 + 100
= 100 x 4
= 400
C2 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
= 125 x 4 - 25 x 4
= ( 125 - 25 ) x 4
= 100 x 4
= 400
1: Tính nhanh:
a, 2376 + 3425 - 376 - 425
= ( 2376 - 376 ) + ( 3425 - 425 )
= 2000 + 3000
= 5000.
b, 4638 - 2437 + 5362 - 7563
= 2210 + (-2210)
= 0.
c, 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15 + 15
= ( 45 + 15 ) + ( 45 + 15 ) + ( 45 + 15 ) + ( 45 + 15 )
= 60 + 60 + 60 + 60
= 240.
d, 4 x 125 x 25 x 8
= ( 4 x 25 ) x ( 125 x 8 )
= 100 x 1000
= 100000.
e, 2 x 8 x 50 x 25 x 125
= ( 2 x 50 ) x ( 8 x 125 ) x 25
= 100 x 1000 x 25
= 2500000.
2: Tính nhanh bằng hai cách:
125 + 125 + 125 + 125 - 25 - 25 - 25- 25
= ( 125 - 25 ) + ( 125 - 25 ) + ( 125 - 25 ) + ( 125 -25 )
= 100 + 100 + 100 + 100
= 400.
Tìm x:
a) x + 27 = 45
b) x - 27 = 45
c) 45 - x = 27
d) 25 + x = 18 + 52
Bài làm:
a) x + 27 = 45
x = 45 - 27
x = 18
Vậy x = 18
b) x - 27 = 45
x = 45 + 27
x = 72
Vậy x = 72
c) 45 - x = 27
x = 45 - 27
x = 18
Vậy x = 18
d) 25 + x = 18 + 52
25 + x = 70
x = 70 - 25
x = 45
Vậy x = 45