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a) 1284 - 3905 : 55 + 89 = 1284 - 71 + 89
= 1213 + 89
= 1302
b) 1606 + 54495 : 45 x 6 = 1606 + 1211 x 6
= 1606 + 7266
= 8872
k mình nha bạn ^ ^
1284-3905:55+89
=1284-71+89
=1213+89
=1302
1606+54495:45*6
=1606+1211*6
=1606+7266
=8872
10000-777:21x63=7669 4968+709x52-555=41281
1284-3905:55+98=1311 1606+54495:45x6=8872
(161,4-68,9):37-15,24=92,5:37-15,24=2,5-15,24=-12,74 nha
~HT~
k cho mình nha
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\(\frac{1+3+5+...+2009}{1+2+3+...+2010}\)
\(=\frac{\frac{\left[\left(2009-1\right):2+1\right]\left(2009+1\right)}{2}}{\frac{\left(2010+1\right)2010}{2}}\)
\(=\frac{\frac{1005.2010}{2}}{\frac{2011.2010}{2}}\)
\(=\frac{1005.2010}{2}.\frac{2}{2011.2010}\)
\(=\frac{1005}{2011}\)
\(\frac{6:\frac{3}{5}-1\frac{1}{6}.\frac{6}{7}}{4\frac{1}{5}.\frac{10}{11}+5\frac{2}{11}}=\frac{10-\frac{7}{6}.\frac{6}{7}}{\frac{21}{5}.\frac{10}{11}+\frac{57}{11}}=\frac{10-1}{\frac{42}{11}+\frac{57}{11}}=\frac{9}{9}=1\)
C = 59/10 : 3/2 - ( 5/3 x 9/2 x 14/3) : 7/4
= 59/15 - 35 : 7/4
= 59/15 - 20
= -241/15
\(\frac{3}{5}-\frac{6}{8}:\frac{3}{5}\)
=>\(\left(1-\frac{6}{8}\right):\frac{3}{5}\)
=>\(\frac{1}{4}:\frac{3}{5}\)
=>\(\frac{1}{4}\times\frac{5}{3}\)
=>\(\frac{5}{12}\)
10 000 - 777 : 21 x 63
= 10 000 - 37 x 63
= 10 000 - 2331
= 7669
4 968 + 709 x 52 - 555
= 4 968 + 36 868 - 555
= 41 281
10 000 - 777 : 21 x 63 = 10 000 - 37 x 63
= 10 000 - 2331
= 7669
4 968 + 709 x 52 - 555 = 4 968 + 36 868 - 555
= 41 836 - 555
= 41 281