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\(a,67\times153-53\times67+712:8\)
\(=67\times\left(153-53\right)+\left(712:8\right)\)
\(=67\times100+89\)
\(=6700+89\)
\(=6789\)
\(b,168-\left\{5\times\left[143-\left(15-12\right)^2\right]+10\right\}:10\)
\(=168-\left\{5\times\left[143-3^2\right]+10\right\}:10\)
\(=168-\left\{5\times134+10\right\}:10\)
\(=168-\left\{670+10\right\}:10\)
\(=168-680:10\)
\(=168-68\)
\(=100\)
\(c,\left(-13\right)+84+\left(-87\right)+16\)
\(=13+84-87+16\)
\(=\left(13+87\right)-\left(84+16\right)\)
\(=100-100\)
\(=0\)
\(d,9-\left(12-15\right)\)
\(=9-\left(-3\right)\)
\(=12\)
Bài 1 :
\(a)\frac{-17}{30}-\frac{11}{-15}+\left(-\frac{7}{12}\right)\)
\(=\frac{1}{6}+\left(-\frac{7}{12}\right)\)
\(=-\frac{5}{12}\)
\(b)-\frac{5}{9}+\frac{5}{9}:\left(1\frac{2}{3}-2\frac{1}{12}\right)\)
\(=-\frac{5}{9}+\frac{5}{9}:\left(\frac{5}{3}-\frac{25}{12}\right)\)
\(=-\frac{5}{9}+\frac{5}{9}:\left(-\frac{5}{12}\right)\)
\(=-\frac{5}{9}+\left(-\frac{2}{3}\right)\)
\(=-\frac{1}{9}\)
\(c)-\frac{7}{25}\times\frac{11}{13}+\left(-\frac{7}{25}\right)\times\frac{2}{13}-\frac{18}{25}\)
\(=-\frac{77}{325}+\left(-\frac{14}{325}\right)-\frac{18}{25}\)
\(=-\frac{7}{25}-\frac{18}{25}\)
\(=-1\)
bài 1
:\(-15.67-15.\left(-33\right)-66.15\)
\(=15.\left(-67\right)-15.\left(-33\right)-15.66\)
\(=15.\left(-67+33-66\right)\)
\(=15.\left(-100\right)\)
\(=-1500\)
bài 2.
\(\left(x-2\right)^2-\left|-7\right|=9\)
\(=\left(x-2\right)^2\)
\(a,\left(x-2\right)^2-|-7|=9\)
\(\left(x-2\right)^2-7=9\)
\(\left(x-2\right)^2=16\)
\(\left(x-2\right)^2=\sqrt{16}=4^2\)
\(Th1:x-2=4\Leftrightarrow x=6\)
\(Th2:x-2=-4\Leftrightarrow x=-2\)
\(b,\left(x+4\right)\left(x^2-9\right)=0\)
\(Th1:x+4=0\Leftrightarrow x=-4\)
\(x^2-9=0\Leftrightarrow x^2=9\Leftrightarrow x=\pm9\)