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a/\(450:\left(x-19\right)=50\)
=>\(x-19=9\)
=>\(x=28\)
Vậy...
b/\(3^2.\left(x+4\right)-5^2=5x.2^2\)
\(9\left(x+4\right)=20x+25\)
\(20x+25=9x-36\)
\(11x=-61\)
\(x=-\dfrac{61}{11}\)
Vậy..
c/Tương tự
d/Tương tự
\(3^x+4^2=19^0.\left(19^3.19^2\right)-3.1^{2005}\)
\(3^x+16=1.19^5-3.1\)
\(3^x+16=2476099-3\)
\(3^x+16=2476096\)
\(3^x=2476096-16\)
\(3^x=2476080\)
\(3^x=2^4.3^2.5.19.181\)
\(\Rightarrow x\in\left\{\varnothing\right\}\)
Vậy,...
2.(x-3)-3.(x-1)=5-3.(x-2)+x+19
2x-6-3x+3=5-3x+6+x+19
-x-3=30-2x
-x+2x=3+30
x=33
\(1,5x+2\left(x+\frac{1}{2}\right)=7\)
\(\Rightarrow5x+2x+1=7\)
\(\Rightarrow7x=6\)
\(\Rightarrow x=\frac{6}{7}\)
\(2,8x-3\left(x+2\right)=9\)
\(8x-3x-6=9\)
\(5x=15\)
\(x=3\)
a) \(\left|x\right|+2=2^3.\left(-2\right)^2\)
\(\Leftrightarrow\)\(\left|x\right|+2=32\)
\(\Leftrightarrow\)\(\left|x\right|=30\)
\(\Leftrightarrow\)\(x=\pm30\)
Vậy...
b) \(\left|x\right|+4=\left(-3\right)^2+\left(-2\right)\)
\(\Leftrightarrow\)\(\left|x\right|+4=7\)
\(\Leftrightarrow\)\(\left|x\right|=3\)
\(\Leftrightarrow\)\(x=\pm10\)
Vậy...
b2 :
a) 5 . ( -5 - 6 )
= 5 . ( -11 )
= -55
b) 321 + { - 15 + [ 30 + ( -321 ) ] }
= 321 + { - 15 + [ - 291 ] }
= 321 + ( - 306 )
= 15
19 . 92 - 9 . ( - 19 ) - 19
= 1748 - ( -171 ) - 19
= 1919 - 19
= 1900
\(19^3+\left(2\cdot2\cdot2+2^3\right)\)
\(=19^3+8+8\)
\(=19^3+16=6875\)
19^3+(2×2×2+2^3)
=19^3+(2^3+2^3)
=6859+(8+8)
=6859+16
=6875