Tính bằng cách thuân tiện nhất 112 +271 +322
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654398 + 362 + 999 + 51
= ( 654398 + 362 ) + ( 999 + 51 )
= 654760 + 1050
= 655810
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= 75,9 x 11 - 75,9 x 1
= 75,9x [11-1]
= 75,9 x 10
= 759
Thế này mới đúng nha bạn, mình thấy mấy bạn kia làm tắt một bước rồi
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\(\frac{2}{3}\cdot\frac{4}{7}+\frac{2}{3}\cdot\frac{3}{7}\)
=\(\frac{2}{3}\left(\frac{4}{7}+\frac{3}{7}\right)\)
= \(\frac{2}{3}\cdot1\)
= \(\frac{2}{3}\)
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\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{21.11.2.4.17}{11.17.3.21}=\frac{\left(21.11.17\right).\left(2.4\right)}{\left(11.17.21\right).3}=\frac{2.4}{3}=\frac{8}{3}\)
\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{5.7.13.2}{7.2.13.5.5}=\frac{5.7.13.2}{5.7.13.2.5}=\frac{2}{2.5}=\frac{1}{5}\)
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a) 6257 + 989 + 743
= 6257 +743 + 989
= 7000 + 989 = 7989
b) 5798 + 322 + 4678
= 5798 + 5000 = 10798
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\(25\times32\times125\times15\\=(25\times4)\times(8\times125)\times15\\=100\times1000\times15\\=100000\times15\\=1500000\)
25 x 32 x 125 x 15
=(125 x 32 ) x (25 x 15 )
= 4000 x 375
=1 500 000