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a, 2,5 x 16,27 x 4 + 7,3
\(=\left(2,5\times4\right)\times16,27+7,3\)
\(=10\times16,27+7,3\)
\(=162,7+7,3\)
\(=170\)
b, 0,25 x 1,25 x 8 x 4 x 0,5
\(=\left(0,25\times4\right)\times\left(1,25\times8\right)\times0,5\)
\(=1\times10\times0,5\)
\(=5\)
c, 500 x 3,26 x 0,02 : 0,5
\(=\left(500\times0,02\right)\times3,26\div0,5\)
\(=10\times3,26\times\frac{10}{5}\)
\(=3,26\times20\)
\(=65,2\)
d, 32,4 x 6,24 + 3,66 x 32,4 + 0,5
\(=32.4\times\left(3,66+6,24\right)+0,5\)
\(=32,4\times9,9+0,5\)
\(=320,76+0,5\)
\(=321,26\)
e, 17,2 x 9,55 + 9,45 x 17,2 + 17,2
cố gắng tìm nhân tử chung hay nhóm làm sao ra dcd số tròn chục hay trăm j đó là xong rồi
a) 2,5 x 16,27 x 4 + 7,3
= 2,5 x 4 x 16,27 + 7,3
= 10 x 16,27 + 7,3
= 162,7 + 7,3
= 170
b) 0,25 x 1,25 x 8 x 4 x 0,5
= (0,25 x 4) x (1,25 x 8) x 0,5
= 1 x 10 x 0,5
= 10 x 0,5
= 5
c) 500 x 3,26 x 0,02 : 0,5
= 500 x 3,26 x 0,02 x 2
= (500 x 2 x 0,02) x 3,26
= 20 x 3,26
= 2 x 3,26 x 10
= 6,52 x 10
= 65,2
d) 32,4 x 6,24 + 3,66 x 32,4 + 0,5
= 32,4 x (6,24 + 3,66) + 0,5
= 32,4 x 9,9 + 0,5
= 320,76 + 0,5
= 321,26
d) 17,2 x 9,55 + 9,45 x 17,2 + 17,2
= 17,2 x (9,55 + 9,45 + 1)
= 17,2 x 20
= 17,2 x 10 x 2
= 172 x 2
= 344
= 34,8: ( 1,8+ 4) - 1,9
=34,8: 2, 2- 1,9
= 348/ 10x 10/ 22- 19/10
=174/ 5x 5/ 11- 19/10
= 174/11- 19/11
= 174- 19/11
=155/11
\(a)\frac{4^{17}.3^4.9^6}{6^{13}}=\frac{2^{34}.3^4.3^{12}}{2^{13}.3^{13}}=\frac{2^{21}.3^{16}}{3^{13}}=2^{21}.3^3\)
\(b)\frac{2^{16}+2^8}{2^{13}+2^5}=\frac{2^8\left(2^8+1\right)}{2^5\left(2^8+1\right)}=\frac{2^3\left(2^8+1\right)}{2^8+1}=2^3=8\)
\(a,\frac{4^{17}\times3^4\times9^6}{6^{13}}\)
\(=\frac{2^{34}\times3^4\times3^{12}}{2^{13}\times3^{13}}\)
\(=\frac{2^{34}\times3^{16}}{2^{13}\times3^{13}}\)
\(=2^{21}\times3^3\)
\(b,\frac{2^{16}+2^8}{2^{13}+2^5}\)
\(=\frac{2^8\left(2^8+2^0\right)}{2^5\left(2^8+2^0\right)}\)
\(=\frac{2^8}{2^5}\)
\(=8\)
~Study well~
A=\(\frac{3}{9.6}+\frac{5}{2.7.9}+\frac{7}{6.7.7}+\frac{8}{3.7.29}\) = \(\frac{1}{18}+\frac{5}{7.18}+\frac{1}{6.7}+\frac{8}{3.7.29}\)
= \(\frac{7+5}{7.18}+\frac{1}{6.7}+\frac{8}{3.7.29}\)=\(\frac{2}{7.3}+\frac{1}{6.7}+\frac{8}{3.7.29}\)= \(\frac{1}{3.7}.\)(\(\frac{2}{1}+\frac{1}{2}+\frac{8}{29}\))=
=\(\frac{1}{21}.\)(\(\frac{116+29+16}{58}\))=\(\frac{1}{21}.\frac{161}{58}=\frac{161}{1218}\)
25 . 5 . 4 . 27 . 2
= ( 25 . 4 ) . ( 5 . 2 ) . 27
= 100 . 10 . 27
= 1000 . 27
= 27 000
a: =1103/130+1497/130=20
b: =29,12-9,12=20