tinh bang cach thuat tien nhat
a 2x 3/4 +2 x 1/4
b 3x 2/3 -3x1/3
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a)1 /3 +1/4+2/3+3/4=\(\frac{1}{3}\)+\(\frac{2}{3}\)+\(\frac{1}{4}\)+\(\frac{3}{4}\)=1+1=2
b)1/2 +/3 -/5 +1/6=4/5
a,1/3+1/4+2/3+3/4
=(1/3+2/3)+(1/4+3/4)
= 1 + 1
= 2
nha, còn phàn b mình chưa biết
a)1/3+1/4+2/3+3/4
=(1/3+2/3)+(1/4+3/4)
=1+1
=2.
b)1/2+1/3-1/5+1/6
=(1/2+1/3+1/6)-1/5
=1-1/5
=4/5
c)2/3x4/5+1/3x4/5
=4/5x(2/3+1/3)
=4/5x1
=4/5
d)2/3x4/5-1/3x4/5
=4/5x(2/3-1/3)
=4/5x1/3
=4/15
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
= (1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) +5
= 10 + 10 + 10 +10 + 5
= 10 x 4 + 5
= 40 + 5
= 45
\(a,\dfrac{5}{9}\times\dfrac{5}{2}+\dfrac{4}{9}\times\dfrac{5}{2}=\dfrac{5}{2}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)=\dfrac{5}{2}\times1=\dfrac{5}{2}\)
\(12\times\dfrac{3}{4}-\dfrac{3}{4}\times\dfrac{12}{7}=\dfrac{3}{4}\times\left(12-\dfrac{12}{7}\right)=\dfrac{3}{4}\times\dfrac{72}{7}=\dfrac{54}{7}\)
a) 2 x 3/4 + 2 x 1/4 = 2 x (3/4 + 1/4)
= 2 x 1
= 2
b) 3 x 2/3 - 3 x 1/3 = 3 x (2/3 - 1/3)
= 3 x 1/3
= 1
A : 2 . 3/4 + 2 . 1/4
=3/2 + 1/2
= 2
B : 3.2/3-3.1/3
=2-1
=1