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a. (-15)+x=-55
\(x=-55+15\)
\(x=-40\)
b. -75-4(-x+10)=95
\(4.\left(-x+10\right)=-75-95\)
\(4.\left(-x+10\right)=-170\)
\(-x+10=-42,5\)
\(-x=-52,5\)
\(x=52,5\)
c. |x-3|=12
\(\Rightarrow\orbr{\begin{cases}x-3=12\\x-3=-12\end{cases}\Leftrightarrow\orbr{\begin{cases}x=15\\x=-9\end{cases}}}\)
\(\Rightarrow x\in\left\{-9;15\right\}\)
Tính hợp lí: ( bổ sung nếu có thể :D)
{3.(-5).(-7)0 -[42+(-3)2]}:|-16|
\(=\left\{\left(-15\right).\left(-7\right)-\left[16-9\right]\right\}:16\)
\(=\left\{105-7\right\}:16\)
\(=98:16\)
\(=6,125\)
chúc bạn học tốt
a) x=-40
b)x= 52.5
c)x= 15 hoặc -9
2.5
ai ffan asta giơ tay lên
1. tìm x
kết quả x là : 2010
2. tìm x
a) x = 13
b) x = 6
đúng ko
câu 3 số lớn quá
1.
1(1+2+3+4+....+x)=2021055
1+2+3+4+....+x=2021055:1=2021055
x+(x+1)/1=2021055
=>x(x+1)=1*2021055=2021055=2011*2010 =>x=2010
a. -2015 + ( -21 + 75 + 2015 ) = 0 + ( -21 ) + 75 = 54
b. 13 - 12 + 11 + 10 - 9 + 8 - 7 - 6 + 5 - 4 + 3 + 2 -1 = 1 + 11 + 1 + (-5) + 1 + 3 + 1 = 13

a.
\(\left(-12\right).x-4=5^2.\left(-4\right)\)
\(\Leftrightarrow\left(-12\right).x-4=25.\left(-4\right)\)
\(\Leftrightarrow\left(-12\right).x-4=-100\)
\(\Leftrightarrow\left(-12\right).x=4-100\)
\(\Leftrightarrow\left(-12\right).x=-96\)
\(\Leftrightarrow x=\left(-96\right):\left(-12\right)\)
\(\Leftrightarrow x=8\)
b.
\(\left(-2015+184\right)-\left(84-2015\right)+\left(-200\right)\)
\(=\left(-2015+2015\right)+\left(184-84\right)+\left(-200\right)\)
\(=0+100+\left(-200\right)\)
\(=-100\)
a) (-12).x - 4 = 5².(-4)
-12x - 4 = 25.(-4)
-12x - 4 = -100
-12x = -100 + 4
-12x = -96
x = -96 : (-12)
x = 8
x=8:| (dễ vậy mà):>
Đáp án:
a/
(−12) . x − 4= 52
. (−4)
⇔(−12).�−4=25.(−4)(−12) . x − 4 = 25 . (−4)
⇔(−12).�−4=−100(−12) . x − 4= −100
⇔(−12).�=4−100(−12) . x = 4 - (−100)
⇔(−12).�=−96(−12) . x = −96
⇔�=(−96):(−12)x = (−96) : (−12)
⇔�=8x = 8
b/
(−2015+184)−(84−2015)+(−200)(−2015 + 184)− (84 − 2015) + (−200)
=(−2015+2015)+(184−84)+(−200)= (−2015 + 2015) + 184 − 84) + (−200)
=0+100+(−200)= 0 + 100 + (−200)
=−100= - 100
a.
(−12).�−4=52.(−4)(−12).x−4=52.(−4)
⇔(−12).�−4=25.(−4)⇔(−12).x−4=25.(−4)
⇔(−12).�−4=−100⇔(−12).x−4=−100
⇔(−12).�=4−100⇔(−12).x=4−100
⇔(−12).�=−96⇔(−12).x=−96
⇔�=(−96):(−12)⇔x=(−96):(−12)
⇔�=8⇔x=8
b.
(−2015+184)−(84−2015)+(−200)(−2015+184)−(84−2015)+(−200)
=(−2015+2015)+(184−84)+(−200)=(−2015+2015)+(184−84)+(−200)
=0+100+(−200)=0+100+(−200)
=−100=−100