1/4*1/2+1/6*1/2=1/8+1/12=20/96 C2 ( 1/4+1/6)*1/2
=10/24*1/2=10/48
b,(3/2-2/5)*1/3=11/10*1/3 C2 3/2*1/3+2/5*1/3
=3/6+2/15= 53/90
=11/30
\(\left(\frac{1}{4}+\frac{1}{6}\right)x\frac{1}{2}\) \(\left(\frac{3}{2}-\frac{2}{5}\right)x\frac{1}{3}\)
\(c1:=\frac{5}{12}x\frac{1}{2}=\frac{5}{24}\) \(c1:\frac{11}{10}x\frac{1}{3}=\frac{11}{30}\)
\(c2:=\frac{1}{4}x\frac{1}{2}+\frac{1}{6}x\frac{1}{2}\) \(c2:\frac{3}{2}x\frac{1}{3}-\frac{2}{5}x\frac{1}{3}\)
\(=\frac{1}{8}+\frac{1}{12}=\frac{12}{96}+\frac{8}{96}=\frac{20}{96}=\frac{5}{24}\) \(=\frac{1}{2}-\frac{2}{15}=\frac{11}{30}\)
CHÚC BẠN HỌC GIỎI
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Tính bằng hai cách
A) (2/3×4/5)×5/6
B) (1/2+1/3)×1/5
(2/3x4/5)x5/6 B)(1/2+1/3)x1/5
=5/6x1/5=1/6
C1:8/15x5/6=4/9 C2:1/2x1/5+1/3x1/5
C2:(2/3x4/5)x5/6 =1/10+1/15
=(2/3x5/6)x(4/5x5/6) =3/30+2/30
=5/9x2/3 =1/6
=10/27
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