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a) 80 - ( 4.52 - 3.23)
= 80 - ( 4.25 - 3.8 )
= 80 - ( 100 -24 )
= 80 - 76
= 4
b)c)d)e)f) ( thôi lười lắm )
~HT~
\(a)\)\(80-\left(4.5^2-3.2^3\right)\)
\(=\)\(80-\left(4.25-3.8\right)\)
\(=\)\(80-\left(100-24\right)\)
\(=\)\(80-76\)
\(=\)\(4\)
\(b)\)\(5^6\div5^4+2^3.2^2-1^{2017}\)
\(=\)\(5^2+2^5-1\)
\(=\)\(25+32-1\)
\(=\)\(57-1\)
\(=\)\(56\)
\(a)\)\(142-\left[50-\left(2^3.10-2^3.5\right)\right]\)
\(=\)\(142-\left[50-\left(8.10-8.5\right)\right]\)
\(=\)\(142-\left[50-\left(80-40\right)\right]\)
\(=\)\(142-\left[50-40\right]\)
\(=\)\(142-10\)
\(=\)\(132\)
\(b)\)\(375\div\left\{32-\left[4+\left(5.3^2-42\right)\right]\right\}-14\)
\(=\)\(375\div\left\{32-\left[4+\left(5.9-42\right)\right]\right\}-14\)
\(=\)\(375\div\left\{32-\left[4+\left(45-42\right)\right]\right\}-14\)
\(=\)\(375\div\left\{32-\left[4+3\right]\right\}-14\)
\(=\)\(375\div\left\{32-7\right\}-14\)
\(=\)\(375\div25-14\)
\(=\)\(15-14\)
\(=\)\(1\)
=(2/2.4 + 2/4.6 + 2/6.8 +...+ 2/2016.2018).2
=(1/2-1/4+1/4-1/6+1/6-1/8+...+1/2016-1/2018).2
=(1/2-1/2018).2
=1008/2018.2
=2016/2018
\(\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+...+\frac{4}{2016.2018}\)
\(=\)\(2.\left(\frac{2}{2.4}+\frac{2}{4.6}+\frac{2}{6.8}+...+\frac{2}{2016.2018}\right)\)
\(=\)\(2.\left(\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{6}+\frac{1}{6}-\frac{1}{8}+...+\frac{1}{2016}-\frac{1}{2018}\right)\)
\(=\)\(2.\left(\frac{1}{2}-\frac{1}{2018}\right)\)
\(=\)\(2.\frac{504}{1009}\)
\(=\)\(\frac{2016}{2018}\)
\(=\)\(\frac{1008}{1009}\)
l trắc nghiệm
1 a 2 d 3 b 4 c 5 b 6 c
ll tự luân
phiền cậu lm nốt nhé
giúp mk nha