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2.17.12=408
4.6.21=504
8.3.62=1488
2.17.12+4.6.21+8.3.62=408+504+1488=2400
K nhé MN????????
HOk tốt!!!!!!
\(2.17.12+4.6.21+8.3.62\)
\(=24.17+24.21+24.62\)
\(=24\left(17+21+62\right)\)
\(=24.100\)
\(=2400\)
\(37.24+37.76+63.79+63.21\)
\(=37\left(27+76\right)+63\left(79+21\right)\)
\(=37.100+63.100\)
\(=3700+6300\)
\(=10000\)
1 + 2 + 3 + 4 + ..... + 49 + 50(có 50 số hạng)
=51 × 25 = 1275
2 . 17 . 12 + 4 . 6 . 21 + 8 . 3 . 62
= 24 . 17 + 24 . 21 + 24 . 62
= 24 . ( 17 + 21 + 62 )
= 24 . 100 = 2400
37 . 24 + 37 . 76 + 63 . 79 + 63 . 21
= 37 . (24 + 76) + 63 . (79 + 21)
= 37 . 100 + 63 . 100
= (37 + 63 ) . 100
= 100 . 100 = 10000
2020 . 43 + 2020 . 56 + 2020
= 2020 . 43 + 2020 . 56 + 2020 . 1
= 2020 . ( 43 + 56 + 1 )
= 2020 . 100 = 202000
mk k biết xin lỗi bạn nha!
mk k biết xin lỗi bạn nha!
mk k biết xin lỗi bạn nha!
mk k biết xin lỗi bạn nha!
\(\frac{2.6.12+6.12.20+12.21.32}{3.8.15+9.16.25+18.28.40}\)
\(=\frac{12.\left(12+120+672\right)}{3.\left(120+1200+6720\right)}\)
\(=\frac{12.\left(12+120+672\right)}{30\left(12+120+672\right)}\)
\(=\frac{12}{30}\)
\(=\frac{2}{5}\)
\(\frac{2.6.12+6.12.20+12.21.32}{3.8.15+9.16.25+18.28.40}\)
=\(\frac{2.6.12+6.12.2.10+12.3.7.4.8}{3.8.15+9.2.8.5.5+9.2.28.40}\)
=\(\frac{144+144.10+144.56}{360+360.10+360.56}\)
=\(\frac{144\left(1+10+56\right)}{360\left(1+10+56\right)}\)
=\(\frac{144.67}{360.67}\)
=\(\frac{72.2.67}{72.5.67}\)
=\(\frac{2}{5}\)
2.17.12+2.6.12+8.3.62
=24.17+24.6+24.62
=24.(17+6+62)
=24.85
=2040
\(2.17.12+2.16.12+8.3.62\)
\(=24.17+24.6+24.62\)
\(=24.\left(17+6+62\right)\)
\(=24.85\)
\(=2040\)