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( 3/8 + 2/8) +1/8= 3/8 + 2/8 +1/8= 3/8 + 3/8= 3/4
3/8 + (2/8 +1/8)= 3/8 + 2/8 +1/8= 3/8 + 3/8= 3/4
( 3/8 + 2/8) + 1/8....3/8+(2/8+1/8)= 3/4+.....+3/4
\(\left(\frac{3}{8}+\frac{2}{8}\right)+\frac{1}{8}=\frac{3}{8}+\left(\frac{2}{8}+\frac{1}{8}\right)=\frac{3}{8}+\frac{3}{8}=\frac{6}{8}=\frac{3}{4}\) (tính chất kết hợp)
\(\Rightarrow\left(\frac{3}{8}+\frac{2}{8}\right)+\frac{1}{8}=\frac{3}{8}+\left(\frac{1}{8}+\frac{2}{8}\right)\)
\(^{16.48+8.2.24+16.8+2.10.2.8}\)
\(=16.48+16.24+16.8+20.16\)
\(=16.\left(48+24+8+20\right)\)
\(=16.100\)
\(=1600\)
16 x 48 + 8 x 2 x 24 + 16 x 8 + 2 x 10 x 2 x 8
= 16 x 48 + 16 x 24 + 16 x 8 + 16 x 20
= 16 x (48 + 24 + 8 + 20)
= 16 x 100 = 1600
\(a)\frac{3}{8}+\frac{2}{5}+\frac{5}{8}=\left(\frac{3}{8}+\frac{5}{8}\right)+\frac{2}{5}=1+\frac{2}{5}=\frac{7}{5}\)
\(b)\frac{5}{7}.\frac{2}{3}.\frac{14}{15}=\frac{5.2.14}{7.3.15}=\frac{4}{9}\)
\(c)\frac{3}{8}+\frac{2}{5}.\frac{5}{8}=\frac{3}{8}+\frac{1}{4}=\frac{3}{8}+\frac{2}{8}=\frac{5}{8}\)
\(d)\frac{11}{15}-\left(\frac{2}{3}-\frac{1}{5}\right)=\frac{11}{15}-\frac{7}{15}=\frac{4}{15}\)
~Học tốt~
\(a)\frac{3}{8}+\frac{2}{5}+\frac{5}{8}=\left(\frac{3}{8}+\frac{5}{8}\right)+\frac{2}{5}=1+\frac{2}{5}=\frac{7}{5}\)
\(b)\frac{5}{7}.\frac{2}{3}.\frac{14}{15}=\frac{5.2.14}{7.3.15}=\frac{4}{9}\)
\(c)\frac{3}{8}+\frac{2}{5}.\frac{5}{8}=\frac{3}{8}+\frac{1}{4}=\frac{3}{8}+\frac{2}{8}=\frac{5}{8}\)
\(d)\frac{11}{15}-\left(\frac{2}{3}-\frac{1}{5}\right)=\frac{11}{15}-\frac{7}{15}=\frac{4}{15}\)
~Học tốt~
a) \(\frac{3}{8}+\frac{2}{5}+\frac{5}{8}=\frac{3}{8}+\frac{5}{8}+\frac{2}{5}=\frac{3+5}{8}+\frac{2}{5}\)
\(=1+\frac{2}{5}=\frac{5}{5}+\frac{2}{5}=\frac{7}{5}\)
b) \(\frac{5}{7}\times\frac{2}{3}\times\frac{14}{15}=\frac{5}{7}\times\frac{14}{15}\times\frac{2}{3}=\frac{5\times2\times7}{7\times3\times5}\times\frac{2}{3}\)
\(=\frac{2}{3}\times\frac{2}{3}=\frac{4}{9}\)
c) \(\frac{3}{8}+\frac{2}{5}\times\frac{5}{8}=\frac{3}{8}+\frac{2\times5}{5\times8}=\frac{3}{8}+\frac{2}{8}\)
\(=\frac{5}{8}\)
d) \(\frac{11}{15}-\left(\frac{2}{3}-\frac{1}{5}\right)=\frac{11}{15}-\frac{2}{3}+\frac{1}{5}=\frac{11}{15}-\frac{2\times5}{3\times5}+\frac{3\times1}{3\times5}\)
\(=\frac{11}{15}-\frac{10}{15}+\frac{3}{15}=\frac{11-10+3}{15}=\frac{4}{15}\)
1/2 > 1/8
2/8 > 2/16
-Tk cho mk nha-
-Mk cảm ơn-
77 x 8 + 15 x 8 + 8 x 8
= 8 x ( 77 + 15 + 8 )
= 8 x 100
= 800
64 x 4 + 8 x 4 + 9 x 2
= 4 x ( 64 + 8 ) +18
= 4 x 72 + 18
= 288 + 18
= 306
2/15 x 3/8 + 3/8 x 2/3 + 3/8 : 5
= 2/15 x 3/8 + 3/8 x 2/3 + 3/8 x 1/5
= 3/8 x ( 2/15 + 2/3 + 1/5 )
= 3/8 x 1
= 3/8
~ Hok tốt ~
#Minh#
đè gì vậy bạn
8/2=4 đúng ko ?
Ai k mình mình lại cho