a/ \(259+(249)-401+12\)
\(=508-401+12\)
\(=107+12\)
\(=119\)
b/ \(60.(45-15)-45.(60-15) \)
\(=(60.45-60.15)-(45.60-45.15)\)
\(=(60.45-45.60)-(60.15-45.15)\)
\(=0-(60.15-45.15)\)
\(=0-15.(60-45)\)
\(=0-15.15\)
\(=0-225\)
\(=-225\)
c/ \((-79).(-88)+(-21).(-88)\)
\(=\left(-88\right).\left[\left(-79\right)+\left(-21\right)\right]\)
\(=\left(-88\right).\left(-100\right)\)
\(=8800\)
d/ (Chắc là đề sai nhưng mình vẫn làm giúp bạn)
\(\left\{\left[14\div2\right]+7\right\}\div2012+\left|-37\right|\)
\(=\left\{\left[14\div2\right]+7\right\}\div2012+37\)
\(=\left\{7+7\right\}\div2012+37\)
\(=14\div2012+37\)
\(=0,006+37\)
\(=37,006\)
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