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1.:892;726;862;762;872
2:825;290;830;370;920
3:762;987;627;837;
4:126;999;837;927;333;
1:892,726,862,762,872
2:825,290,830,370,920
3:987,627,517,913,837,821,837,917
4:126,938,726,948,999,762,837,927,333,872,827
1) a) 387 x 15 + 387 x 39 = 387 x (15+39) = 387 x 54 = 20898
b) 258 x 2 x 5 = 258 x 10 = 2580
c) 125 x 25 x 4 x 8 = 125 x 8 x 25 x 4 = 1000 x 100 = 100000
= ( 25153 + 847 ) + ( 14424 + 576 )
= 26000 + 15000
= 41000
\(\frac{3}{4}\cdot\frac{5}{7}+\frac{5}{7}\cdot\frac{1}{4}=\left(\frac{3}{4}+\frac{1}{4}\right)\cdot\frac{5}{7}=\frac{4}{4}\cdot\frac{5}{7}=1\cdot\frac{5}{7}=\frac{5}{7}\)
(lưu ý dấu . là x nhân ý)
Chúc bạn học tốt!^_^
72+275 +176 +548 +324 +725 +452+928
=(72+928)+(275+725)+(176+324)+(548+452)
=1000+1000+500+1000
=3500
1. ( 8374+3476 )+(8397+8943)+(9558+9482)+(9385+8475)
=11850+17340+19040+17860
=66090
2.(848+932)+(938+972)+(837+263)+(846x2)
=1780+1910+1100+1692
=6482
tick cho mình nha
1) \(=\left(\frac{3}{5}+\frac{2}{5}\right).\frac{6}{11}\)
\(=1.\frac{6}{11}\)
\(=\frac{6}{11}\)
2)\(\frac{17}{25}.\left(\frac{11}{19}+\frac{6}{19}+\frac{2}{19}\right)\)
\(=\frac{17}{25}.1\)
\(=\frac{17}{25}\)
\(\frac{2}{3}\times\frac{4}{5}+\frac{4}{5}\times\frac{1}{2}+\frac{4}{5}\times\frac{1}{6}\)
\(=\left(\frac{2}{3}+\frac{1}{2}+\frac{1}{6}\right)\times\frac{4}{5}\)
\(=\frac{4}{3}\times\frac{4}{5}\)
\(=\frac{16}{15}\)
1: \(939472+928720+846948+387049+837861+847840\)
\(=\left(939472+846948\right)+\left(928720+847840\right)+\left(387049+837861\right)\)
=1786420+1776560+1224910
=4787890
2:
\(38457+8488375+4849573+746503\)
\(=38457+746503+8488375+4849573\)
\(=784960+13337948=14122908\)