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\(-1+6+\left(-11\right)+16+....+996+\left(-1001\right)\)
\(=5+5+....+5+5\)
\(=5.10\)
\(=50\)
-1+6+(-11)+16+.....+996+(-1001)
=[-1+6]+[-11+16]+....+[-991+996]+(-1001)
=5 + 5 +...+ 5 + (-1001)
có 100 số 5
=5 x100+(-1001)
=500+(-1001)
=-501
k cho minh nha
chúc bạn học giỏi
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a: A=120-61x(-8)
=120+488=608
b: =47(-136+36)-(-1)
=-4700+1=-4699
c: C=(-48-304+72)+36
=-352+72+36
=-280+36=-244
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\(\left(1-\frac{1}{3}\right).\left(1-\frac{1}{6}\right).\left(1-\frac{1}{10}\right)...\left(1-\frac{1}{190}\right)\)
\(=\frac{2}{3}.\frac{5}{6}.\frac{9}{10}...\frac{189}{190}\)
\(=\frac{4}{6}.\frac{10}{12}.\frac{18}{20}...\frac{378}{380}\)
\(=\frac{1.4}{2.3}.\frac{2.5}{3.4}.\frac{3.6}{4.5}...\frac{18.21}{19.20}\)
\(=\frac{1.2.3...18}{2.3.4...19}.\frac{4.5.6...21}{3.4.5...20}\)
\(=\frac{1}{19}.\frac{21}{3}\)
\(=\frac{1}{19}.7=\frac{7}{19}\)
\(\left(1-\frac{1}{3}\right).\left(1-\frac{1}{6}\right).\left(1-\frac{1}{10}\right)...\left(1-\frac{1}{190}\right)\)
\(=\frac{2}{3}.\frac{5}{6}.\frac{9}{10}....\frac{189}{190}\)
\(=\frac{4}{6}.\frac{10}{12}.\frac{18}{20}....\frac{378}{380}\)
\(=\frac{1.4}{2.3}.\frac{2.5}{3.4}.\frac{3.6}{4.5}....\frac{18.21}{19.20}\)
\(=\frac{1.2.3....18}{2.3.4....19}.\frac{4.5.6...21}{3.4.5....20}\)
\(=\frac{1}{19}.\frac{21}{3}\)
\(=\frac{1}{19}.7=\frac{7}{19}\)
Ủng hộ mk nha !!! ^_^
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sos
72:6=12