Ko thực hiện phép tính , tìm y a,(y_476)x2=2196x3
b,(y+10248):3=(6800_5480)x6
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a, (y-476)x2=2196x3
(y-476)x2=2196x2+2196
(y-476)x2-2196x2=2196
(y-476-2196)x2=2196
(y-(476+2196)x2=2196
(y-2672)x2=2196
(y-2672)x2=1098x2
(y-2672)x2-1098x2=0
(y-2672-1098)x2=0
(y-(2672+1098)x2=0
(y-3770)x2=0
y-3770=0
y=3770
ĐS: y=3770
\(\dfrac{5x+5y}{3x-3y}:\dfrac{5x}{x^2-y^2}.\)
\(=\dfrac{5\left(x+y\right)}{3\left(x-y\right)}.\dfrac{\left(x-y\right)\left(x+y\right)}{5x}.\)
\(=\dfrac{x+y}{3}.\dfrac{x+y}{x}.\)
\(=\dfrac{\left(x+y\right)^2}{3x}.\)
a: \(=-\left(10x^2+15x-8x-12\right)=-10x^2-7x+12\)
a)
(2018 - 1002.2) + 96 . 100
= (2018 - 2004) + 9600
= 14 + 9600
= 9614
b)
50 . [ 720 : (10 + 70 . 5 ] - 36
= 50 . [ 720 : ( 10 + 350] - 36
= 50 . [ 720 : 360] - 36
= 50 . 2 - 36
= 100 - 36
= 643
tìm x
[ 3 . (2x + 8) - 15] . 4 = 84
[3 . (2x + 8) - 15] = 84 : 4
[3 . (2x + 8) - 15] = 21
[3 . (2x + 8) ] = 21 + 15
[3 . (2x + 8) ] = 36
(2x + 8) = 36 : 3
(2x + 8) = 12
(2x) = 12 - 8
(2x) = 4
x = 4 : 2
x = 2
1\
a)(2018 - 1002 . 2) + 96 .100
=(2018 - 2004) + 9600
=14 + 9600
=9614
b 50.[720:(10 +70.5)]-36
=50.[720:(10+350)]-36
=50.(720:360)-36
=50.2-36
=100-36
=64
2\Tìm x
[3.(2x + 8)-15].4=84
=>3.(2x+8)-15=84:4
=>3.(2x+8)-15=21
=>3.(2x+8)=21+15
=>3.(2x +8)=36
=>2x+8=36:3
=>2x+8=12
=>2x=12-8
=>2x=4
=>X=2
Vậy X=2
CHÚC BẠN HỌC GIỎI
Bài làm
1) 29( 85 - 47 ) + 85( 47 - 29 )
= 29 . 85 - 29 . 47 + 85 . 47 - 29 . 85
= 29 . 85 . ( -29 . 47 + 85 . 47 )
= 29 . 85 . [ 47( -29 + 82 ) ]
= 29 . 85 . ( 47 . 53 )
= 6140315
2) 3 - | x - 7 | = -12
=> | x - 7 | = 3 - ( -12 )
=> | x - 7 | = 15
=> \(\orbr{\begin{cases}x-7=15\\x-7=-15\end{cases}\Rightarrow\orbr{\begin{cases}x=22\\x=-8\end{cases}}}\)
Vậy x = { 22; -8 }
A, (y-476)x2=2196x3
(y-476)x2=2196x2+2196
(y-476)x2-2196x2=2196
(y-476-2196)x2=2196
(y-(476+2196)x2=2196
(y-2672)x2=2196
(y-2672)x2=1098x2
(y-2672)x2-1098x2=0
(y-2672-1098)x2=0
(y-(2672+1098)x2=0
(y-3770)x2=0 y-3770=0
y=3770 ĐS: y=3770