J) \(\left(5^{19}:5^{17}+3\right):7=28:7=4\)

K) \(7^9:7^7-3^2+2^3.5^2=49-9+200=240\)

L) \(1200:2+6^2.2^1+18=600+72+18=690\)

M) \(5^9:5^7+70:14-20=25+5-20=10\)

N) \(3^2.5-2^2.7+83=45-28+83=100\)

O) \(5^9:5^7+12.3+7^0=25+36+1=62\)

P) \(5.2^2+98:7^2=20+2=22\)

Q) \(3^{11}:3^9-147:7^2=9-3=6\)

R) \(295-\left(31-2^2.5\right)^2=295-121=174\)

a) \(|a|=11\Leftrightarrow a=\pm11\)

b) \(|a|=0\Leftrightarrow a=0\)

c) \(-17|a|=-85\Leftrightarrow|a|=5\Leftrightarrow a=\pm5\)

d) \(|a|=|-10|=10\Leftrightarrow a=\pm10\)

e) \(|a|\ge0>7\) => Vô nghiệm

f) \(3|a-1|-7=14\Leftrightarrow3|a-1|=21\Leftrightarrow|a-1|=7\)

Xét 2 TH ra được \(a=8\) và \(a=-6\)

a) \(\left|a\right|=11\Rightarrow a=\pm11\)

b) \(\left|a\right|=0\Rightarrow a=0\)

c) \(17\left|a\right|=-85\)

\(\left|a\right|=-85\div17\)

\(\left|a\right|=-5\)

=> a ko có giá trị nào

d) \(\left|a\right|=\left|-10\right|\Rightarrow a=\pm10\)

e) \(\left|a\right|=-7\)

=> a ko có giá trị nào 

g) \(3\left|a-1\right|-7=14\)

\(3\left|a-1\right|=14+7\)

\(3\left|a-1\right|=21\)

\(\left|a-1\right|=21\div3\)

\(\left|a-1\right|=7\)

\(\left|a-1\right|=\pm7\)

=> a có 2 TH

TH1 : \(a-1=7\Rightarrow a=8\)

TH2 : \(a-1=-7\Rightarrow a=-6\)

~HT~

a) \(\left|x\right|-2=5\Leftrightarrow\left|x\right|=7\Leftrightarrow x=\pm7\)

b) \(\left|x-2\right|=5\Leftrightarrow\orbr{\begin{cases}x-2=5\\x-2=-7\end{cases}\Leftrightarrow\orbr{\begin{cases}x=7\\x=-5\end{cases}}}\)

c) \(2\left(x+7\right)=-16\Leftrightarrow x+7=8\Leftrightarrow x=1\)

d) \(\left(x-5\right)\left(x+7\right)=0\Leftrightarrow\orbr{\begin{cases}x-5=0\\x+7=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=5\\x=-7\end{cases}}}\)

mik đang cần gấp giúp mik nha

a) \(4x-15=-75-x\)

\(\Leftrightarrow4x+x=-75+15\)

\(\Leftrightarrow5x=-60\)

\(\Leftrightarrow x=-12\)

Vậ x=-12

b) \(72-3x=5x+8\)

\(\Leftrightarrow-3x-5x=8-72\)

\(\Leftrightarrow-8x=-64\)

\(\Leftrightarrow x=8\)

Vậy x=8

c) \(3\left|x-7\right|=21\)

\(\Leftrightarrow\left|x-7\right|=7\Leftrightarrow\orbr{\begin{cases}x-7=7\\x-7=-7\end{cases}\Leftrightarrow\orbr{\begin{cases}x=14\\x=0\end{cases}}}\)

Vậy x=14 hoặc x=0

d) \(-7\left|x+3\right|=-49\)

\(\Leftrightarrow\left|x+3\right|=7\)

\(\Leftrightarrow\orbr{\begin{cases}x+3=7\\x+3=-7\end{cases}\Leftrightarrow\orbr{\begin{cases}x=4\\x=-10\end{cases}}}\)

Vậy x=4 hoặc x=-10

a) \(4x-15=-75-x\Leftrightarrow3x=-60\Leftrightarrow x=-20\)

b) \(72-3x=5x+8\Leftrightarrow64=8x\Leftrightarrow x=8\)

c) \(3|x-7|=21\Leftrightarrow|x-7|=7\). Xét 2TH ra được \(x=14\) và \(x=0\)

d) \(-7|x+3|=-49\Leftrightarrow|x+3|=7\). Xét 2 TH ra được \(x=4\) và \(x=-10\)

giúp mik nha mik cần gấp

a) \(\left(-1\right)\left(-2\right)+\left(-3\right)\left(-4\right)-\left(-2\right)\left(-3\right)\)

\(=2+12-6=8\)

b) \(\left(-1\right)\left(-2\right)\left(-3\right)\left(-4\right)\left(-5\right)\div\left[\left(-3\right)-\left(-5\right)\right]\)

\(\left(-120\right)\div\left(-8\right)=15\)

a) \(21.35-3.25.7=21.35-21.25=21\left(35-25\right)=21.10=210\)

b) \(77-11\left(30+7\right)=11.7-11.37=11\left(7-37\right)=11\left(-30\right)=-330\)

c) \(85\left(35-27\right)-35\left(85-27\right)=85.35-85.27-85.35+35.27\)

\(=35.27-85.27=27\left(35-85\right)=27\left(-50\right)=-1350\)

d) \(47\left(45-15\right)-47\left(45+15\right)=47.30-47.60=47\left(-30\right)=-1410\)

giúp mik nha mik đang cần gấp 7 h là mik nộp rùi

1.comes

2.don't

3.walks

4.do

5.teaches

nhanh lên mn ơi

1)  [(-18 )+ (-17 ) ]+(-15)

=-35-15

=-50

2)  666 - ( - 422 ) - 100 - 88

=666+422-100-88

=(666-100)+(422-88)

=566+334

=900

3) - ( - 315 ) + ( - 115 ) - 105 + 25

=315-115-105+25

=(315-115)+(-105+25)

=200-80

=120

4) 888 - (- 333 ) - 222 + 70

=888+333-222+70

=(888-222)+(333+70)

=666+403

=1069

giúp mik với mik đang cần gấp thanks các bạn nhìu

\(0,2.37,1.5+0,1.2530+33,1.10=\left(0,2.5\right).37,1+253+331\)

\(=37,1+253+331=621,1\)