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\(\left(-486\right)-1569+3425-514-\left(-569\right)\)
\(= \left(-486-514\right)+\left(-1569+569\right)+3425\)
\(=-1000-1000+3425=1425\)
\(a,-7624+\left(1543+7624\right)\)
\(=\left[\left(-7624\right)+7624\right]+1543\)
\(=0+1543=1543\)
\(b,\left(27-514\right)-\left(486-73\right)\)
\(=27-514-486+73\)
\(=\left(27+73\right)-\left(514+486\right)\)
\(=100-1000\)
\(=-900\)
Chúc bạn làm bài đạt điểm cao nhé !
a) \(-7624+\left(1543+7624\right)\)
\(=-7624+1543+7624\)
\(=\left(-7624+7624\right)+1543=0+1543=1543\)
b) \(\left(27-514\right)-\left(486-73\right)\)
\(27-514-486+73\)
\(=\left(27+73\right)-\left(514+486\right)=100-1000=-900\)
tk nmk nh. ~học tốt!
\(1,24:0,5+3,76.2\)
\(=2,48+7,52\)
\(=10\)
\(5,28:0,25+4,72.4\)
\(=21,12+18,88\)
\(=40\)
1) \(25+37-48-25-37=\left(25-25\right)+\left(37-37\right)-48=-48\)
2) \(37+35+36+37-14-15-16-17\)
\(=\left(37-17\right)+\left(35-15\right)+\left(36-16\right)+\left(37-14\right)\)
\(=20+20+20+23=83\)
\(\dfrac{1}{15}+\dfrac{1}{35}+\dfrac{1}{63}+\dfrac{1}{99}+\dfrac{1}{143}\\ =\dfrac{1}{3\times5}+\dfrac{1}{5\times7}+\dfrac{1}{7\times9}+\dfrac{1}{9\times11}+\dfrac{1}{11\times13}\\ =\left(\dfrac{2}{3\times5}+\dfrac{2}{5\times7}+\dfrac{2}{7\times9}+\dfrac{2}{9\times11}+\dfrac{2}{11\times13}\right).\dfrac{1}{2}\\ =\left(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{11}+\dfrac{1}{11}-\dfrac{1}{13}\right).\dfrac{1}{2}\\ =\left(\dfrac{1}{3}-\dfrac{1}{13}\right).\dfrac{1}{2}\\ =\dfrac{10}{39}.\dfrac{1}{2}\\ =\dfrac{5}{39}\)
115+135+163+199+1143=13×5+15×7+17×9+19×11+111×13=(23×5+25×7+27×9+29×11+211×13).12=(13−15+15−17+17−19+19−111+111−113).12=(13−113).12=1039.12=539
\(\left(-146\right)-1569+3425-514-\left(-569\right)\)
\(=\left(-146-514\right)+\left(-1569+569\right)+3425\)
\(=-660-1000+3425\)
\(=3425-1660=1765\)
Thank you vinamilk