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a) 13 x 5 x 2 = 13 x (5 x 2)
= 13 x 10
= 130
5 x 2 x 34 = (5 x 2) x 34
= 10 x 34
= 340
b) 2 x 26 x 5 = (2 x 5) x 26
= 10 x 26
= 260
a) 13 x 5 x 2 5 x 2 x 34 b) 2 x 26 x 5
= 13 x ( 5 x 2 ) = ( 5 x 2 ) x 34 = ( 2 x 5 ) x 26
= 13 x 10 = 10 x 34 = 10 x 26
= 130 = 340 = 260
Chúc bạn học tốt!
\(a,\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)
\(=\left(\frac{12}{25}+\frac{13}{25}\right)+\frac{3}{5}\)
\(=\frac{25}{25}+\frac{3}{5}\)
\(=1+\frac{3}{5}\)
\(=\frac{8}{5}\)
\(b,\frac{3}{2}+\frac{2}{3}+\frac{4}{3}\)
\(=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)\)
\(=\frac{3}{2}+2\)
\(=\frac{7}{2}\)
\(c,\frac{3}{5}+\frac{7}{5}+\frac{3}{4}\)
\(=\left(\frac{3}{5}+\frac{7}{5}\right)+\frac{3}{4}\)
\(=2+\frac{3}{4}\)
\(=\frac{11}{4}\)
\(\frac{17}{2}\times\frac{3}{5}+\frac{3}{5}\times\frac{3}{2}\)
\(=\left(\frac{17}{2}+\frac{3}{2}\right)\times\frac{3}{5}\)
\(=\frac{20}{2}\times\frac{3}{5}\)
\(=10\times\frac{3}{5}\)
\(=\frac{30}{5}=6\)
\(a)\frac{4}{9}+\frac{3}{8}+\frac{5}{8}=\frac{4}{9}+(\frac{3}{8}+\frac{5}{8})=\frac{4}{9}+1=\frac{4+9}{9}=\frac{13}{9}\)
\(b)\frac{3}{7}+\frac{2}{3}+\frac{4}{7}=(\frac{3}{7}+\frac{4}{7})+\frac{2}{3}=1+\frac{2}{3}=\frac{3+2}{3}=\frac{5}{3}\)
a)419 x 2 + 419 x 3 + 419 x 5
= 419 x ( 2 + 3 + 5 )
= 419 x 10
= 4190
b) 7020 x 7 - 7020 x 3 - 7020 x 4
= 7020 x ( 7 - 3 - 4 )
= 7020 x 1
= 7020
a, 419 x ( 2 + 3 +5)
= 419 x 10 = 4190.
b, 7020 x ( 7 - 3 - 4)
= 7020 x 0 = 0.
a. 12/25 + 3 / 5+ 13/25 = ( 12/25+13/25)+3/5 = 1 + 3/5= 8/5
b. 3/2 + 2/3 + 4/3 = 3/2+( 2/3+4/3)= 3/2 + 2=7/2
c.3/5+7/5+3/4= (3/5+7/5)+3/4 = 2+ 3/4=11/4
chúc bn hc tốt
a. 12/25+3/5+13/25
=1+3/5
=8/5
b.3/2+2/3+4/3
=3/2+2
=7/2
c.3/5+7/5+3/4
=2+3/4
=11/4
\(a.2\times999999\times5=999999\times\left(2\times5\right)\)
\(=999999\times10=9999990\)
\(b.840\div2\div5=840\div\left(2\times5\right)\)
\(=840\div10=84\)
a)2.999999.5
=2.5.999999
=10.999999
=9999990
b)840:2:5
=840:(2.5)
=840:10
=84
chúc bạn học tốt !!!