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(25x36):9+450-75-25
= 900 : 9 + 450 - 75 -25
= 100 + ( 450 - 75-25)
= 100 + 350
= 450
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( 53 + 34 ) x 9 + 9 x 12 + 9
= 87 x 9 + 9 x 12 + 9
= 9 x ( 87 + 12 + 1 )
= 9 x 100 = 900
(53 + 34) x 9 + 9 x (12 + 9)
= 87 x 9 + 9 x 21
= (87 + 21) x 9
= 972
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phòng có số bộn bàn ghế là : 240 : 15 = 16 [bộ] đ/s:16 bộ
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\(\left(50\times18\right):9\\ 50\times18:9\\ =50\times\left(18:9\right)\\ =50\times2\\ =100\)
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5 × 9 × 2 × 10 + 8 = 5 × 2 × 9 × 10 + 8
= 10 × 90 + 8 = 900 + 8 = 908
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\(\dfrac{5}{9}\times\dfrac{5}{11}+\dfrac{5}{11}\times\dfrac{4}{9}\)
\(=\left(\dfrac{5}{9}+\dfrac{4}{9}\right)\times\dfrac{5}{11}\)
\(=1\times\dfrac{5}{11}\)
\(=\dfrac{5}{11}\)
#NoSimp
\(\dfrac{5}{9}\) \(\times\) \(\dfrac{5}{11}\) + \(\dfrac{5}{11}\) \(\times\) \(\dfrac{4}{9}\)
= \(\dfrac{5}{11}\) \(\times\) ( \(\dfrac{5}{9}\) + \(\dfrac{4}{9}\))
= \(\dfrac{5}{11}\) \(\times\) \(\dfrac{9}{9}\)
= \(\dfrac{5}{11}\)
(25*36):9=900:9=100