124-x+14=87
1) 53 + ( 124 - x ) = 87 2) 12.x - 64= 2^5
53 + (124 - x) = 87
(124 - x) = 87 - 53
(124 - x) = 34
x = 124 - 34
x = 90
12.x - 64 = 25
12.x - 64 = 32
12.x = 32 + 64
12.x = 96
x = 96 : 12
x = 8
\(\text{1)}53+\left(124-x\right)=87\)
\(\left(124-x\right)=87-53=34\)
\(x\) \(=124-34=90\)
\(\text{2)}12.x-64=2^5\)
\(12.x-64=32\)
\(12x\) \(=32+64=96\)
\(x\) \(=96:12=8\)
1) 53 + ( 124 - x ) = 87 ; 2) 12.x - 64= 2^5
câu 1: tìm x
86 - x = 33
câu 2: tìm x
53 + ( 124 - x ) = 87
nhớ chỉ cách làm nhé ^_^
câu 1 86-x=33
x=86-33
x=53
vậy x=53
câu 2 53+(124-x)=87
53+124-x=87
x=53+124-87
x=90
vậy x=90
nhan xet ho to dung chua nha
53+(124-x)=87
(124-x)=87-53
x=124-34
=90
Tìm x ( 2^2 + 3 ) ( x - 5 ) + 14 = 5^2 + 124 : 2^2
(22+3).(x-5)+14=52+124:22
(4+3).(x-5)+14=25+124:4
7.(x-5)+14=25+31
7.(x-5)+14=56
7.(x-5)=42
x-5=6
x=11
Ta có: \(\left(2^2+3\right)\left(x-5\right)+14=5^2+124:2^2\)
\(\Leftrightarrow7\left(x-5\right)=25+31-14=42\)
\(\Leftrightarrow\left(x-5\right)=6\)
hay \(x=11\)
20 : ( x - 5) = 4 . 25 - 20
( 4 + 3) ( x -5) + 14 = 25 + 124 : 4
49 . x - 14 .x = 49 . 10 - 70
Lời giải:
$(2^2+3)(x-5)+14-5^2+124=2^2$
$7(x-5)+113=4$
$7(x-5)=4-113=-109$
$x-5=-109:7=\frac{-109}{7}$
$x=5+\frac{-109}{7}=\frac{-74}{7}$
1) Tính nhanh :
a)-65.(87-17)-87.(17-65)
b)-215.[14+(-1236)]+215.(14-236)
2) Tìm x:
a)-(5x-13)-2(3x+1)=-4(x-8)-(-4)2
a) -65 .( 87 - 17 ) -87 .( 17 - 65 )
= ( - 65 ) . 87 + 17 - 87 . 17 + 65
= { ( - 65 ) + 65 } . 87 + 17
= 0 . 87 + 17
= 17
b) -215 . [ 14 + ( -236 ) ] + 215 . ( 14 - 236 )
= -215 . 14 + ( - 236 ) + 215 . 14 - 236
= [ ( - 215 ) + 215 ] . 14 + { ( - 236 - 236 }
= 0 . 14 + 0
= 0
1) tính nhanh
a)-215 . (14 + (-1236)] + 215 . (14-236)
b)-65 . (87 - 17) - 87. (17 - 65)
2) tìm x
a)-(5x - 13) - 2(3x + 1) = -4(x - 8) - (-4)2
b)2 .|x| - 3. |x| + 18 = x
c)|x - 2| - 3x = 4
Bài 1: Tính nhẩm
(873+373) / (124)-87.37
Ta có: \(\frac{87^3+37^3}{124}-87.37=\frac{\left(87+37\right)\left(87^2-87.37+37^2\right)}{124}-87.37\)
\(=\frac{124\left(87^2-87.37+37^2\right)}{124}-87.37\)
\(=87^2-87.37+37^2-87.37\)
\(=87^2-2.87.37+37^2\)
\(=\left(87-37\right)^2=50^2=2500\)
bạn ơi phải =2500 k
nếu phải k cho mình nhé!
( 28 x 459 - 612 x 14) : X - 87 = 219
Cần gấp trong 4p đúng tickk
\(\left(12852-8568\right):x-87=219\)
\(\Rightarrow4284:x-87=219\)
\(\Rightarrow4284:x=219+87\)
\(\Rightarrow4284:x=306\)
\(\Rightarrow x=4284:306\)
\(\Rightarrow x=14\)
Vậy \(x=14\)
(28 \(\times\) 459 - 612 \(\times\) 14): \(x\) - 87 = 219
(12852 - 8568):\(x\) = 219 + 87
4284 : \(x\) = 306
\(x\) = 4284 : 306
\(x\) = 14