CAU EASY NAY
TINH BANG CACH THUAN TIEN NHAT
2/3 * 10/21 *3/2
22/5 * 12 * 5/12
7/2 * 28/81 * 2/7
5/17 * 21/4 * 47/15 * 0
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Lay (59/18 + 46/9) + (75/14 + 15/7) + (5/2 + 47/18)
De et a
\(a,\dfrac{5}{9}\times\dfrac{5}{2}+\dfrac{4}{9}\times\dfrac{5}{2}=\dfrac{5}{2}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)=\dfrac{5}{2}\times1=\dfrac{5}{2}\)
\(12\times\dfrac{3}{4}-\dfrac{3}{4}\times\dfrac{12}{7}=\dfrac{3}{4}\times\left(12-\dfrac{12}{7}\right)=\dfrac{3}{4}\times\dfrac{72}{7}=\dfrac{54}{7}\)
2x25x50xx8=(25x8)x(50x2)=200x100=20000
12x11+21x11+11x33=11x(12+21+33)=11x66=726
2*25*50*8
=(2*50)*(25*8)
=100*200=20000
12*11+21*11+11*33
=11*(12+21+33)
=11*66=676
a) (3/4 + 3/12) + 2/5=7/5
b) (47/15 - 4/30) + (40/17 - 6/17)= 3 - 2 =1
2/3 * 10/21 * 3/2 = (2/3 * 3/2) * 10/21 = 1 * 10/21 = 10/21
22/5 * 12 * 5/12 = 22/5 * (12 * 5/12) = 22/5 * 5 =22
7/2 * 28/81 * 2/7= (7/2 * 2/7) * 28/81 = 1 * 28/81 =28/81
5/17 * 21/4 * 47/15 * 0 = 0
~Study well~
#Seok_Jin#
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