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= 2010 - (5+5+5+....+5) (100 số 5)
= 2010 - 100 . 5 = 2010 - 500 = 1610
.............(Đề bài)...............
=1/2*2/5+1/5*1/2+1/2*2/5
=(1/2+1/2)+(2/5+1/5+2/5)
=1+1
=2
a,3/5+4/7+2/5+1/7+2/7
= (4/7+1/7+2/7)+(3/5+4/5)
=7/7+5/5
=1+1
=2
b, 1/3+1/6+4/3+2/6+2/3+5/6
=(1/3+4/3+2/3)+(1/6+5/6+2/6)
=7/3+8/6
=7/3+4/3
=11/3
\(a.2\times999999\times5=999999\times\left(2\times5\right)\)
\(=999999\times10=9999990\)
\(b.840\div2\div5=840\div\left(2\times5\right)\)
\(=840\div10=84\)
a)2.999999.5
=2.5.999999
=10.999999
=9999990
b)840:2:5
=840:(2.5)
=840:10
=84
chúc bạn học tốt !!!
Bài làm
\(5x\frac{10}{20}+\frac{10}{20}x5+2x\frac{10}{20}\)
\(=\frac{10}{20}x\left(5+5+2\right)\)
\(=\frac{10}{20}x12\)
\(=\frac{12}{20}\)
\(=\frac{3}{5}\)
# Chúc bạn học tốt #
5*10/20+10/20*5+2*10/20
=(5+5)*10/20+2*10/20
=10*10/20+2*10/20
=5+1
=6
5/12 : 2/5 - 1/3 : 2/5 + 7/12 : 2/5
= 5/12 x 5/2 - 1/3 x 5/2 + 7/12 x 5/2
= (5/12 - 1/3 + 7/12) x 5/2
= (5/12 + 7/12 - 1/3) x 5/2
= (1 - 1/3) x 5/2
= (3/3 - 1/3) x 5/2
= 2/3 x 5/2
= 5/3
\(\frac{5}{12}\):\(\frac{2}{5}\)-\(\frac{1}{3}\): \(\frac{2}{5}\)+ \(\frac{7}{12}\):\(\frac{2}{5}\)= ( \(\frac{5}{12}\)-\(\frac{1}{3}\)+\(\frac{7}{12}\)) : \(\frac{2}{5}\)
= ( \(\frac{1}{12}\)+ \(\frac{7}{12}\)) : \(\frac{2}{5}\)
= \(\frac{8}{12}\): \(\frac{2}{5}\)
=\(\frac{5}{3}\)
a) \(19\times\left(52+38\right)-9\times\left(52+38\right)=\)
\(=\) \(19\times90-9\times90\)
\(=90\times\left(19-9\right)\)
\(=90\times10\)
\(=900\)
b) \(\dfrac{2}{5}\div\dfrac{3}{7}\times\dfrac{3}{7}\div\dfrac{2}{5}+2019=\)
\(=\left(\dfrac{2}{5}\div\dfrac{2}{5}\right)\times\left(\dfrac{3}{7}\div\dfrac{3}{7}\right)+2019\)
\(=1\times1+2019\)
\(=2019\)
a)2010-5-5-...-5-5(100 số 5)
=2010-(5+5+5+....+5+5) (100 số 5)
=2010-(5x100)
=2010-500
=1510
b)38-2+2+2+...2(10 số 2)
=36+2+2+2+...+2(9 số 2)
=36+(2x9)
=36+18
=54