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1152-(374+1152)+(374-65)
=1152-374-1152+374-65(theo quy tắc đổi dấu)
=(1152-1152)+(-374+374)-65
=0+0-65
=-65
372,463 x 999 + 372,463
=372,463 x (999+1)
=372,463 x 1000
=372463
a: \(=-\left(10x^2+15x-8x-12\right)=-10x^2-7x+12\)
\(3^2\cdot5+2^3\cdot10-3^4:3\\ =9\cdot5+8\cdot10-3^4\\ =45+80-27\\ =98\)
\(3^2.5+2^3.10-3^4:3\)
\(=9.5+8.10-3^3\)
\(=45+80-27\)
\(=125-27\)
\(=98\)
\(#WendyDang\)
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
\(60-\left[15.2+\left(4+1^{35}\right)^2\right]\)
\(\Rightarrow60-\left[30+\left(4+1\right)^2\right]\)
\(\Rightarrow60-\left[30+25\right]\)
\(\Rightarrow60-55\)
\(\Rightarrow5\)
Ta có:
\(\left(x-1\right).\left(x+1\right).\left(x+2\right)\)
\(=\left(x^2+x-x-1\right).\left(x+2\right)\)
\(=\left(x^2-1\right).\left(x+2\right)\)
\(=x^3+2x^2-x-2\)
\(D=\dfrac{3\sqrt{2}+9-3+\sqrt{2}}{\left(3-\sqrt{2}\right)\left(3+\sqrt{2}\right)}\left(3-2\sqrt{2}\right)\\ D=\dfrac{2\left(3+2\sqrt{2}\right)\left(3-2\sqrt{2}\right)}{7}=\dfrac{2\left(9-1\right)}{7}=\dfrac{16}{7}\)