a) 1/2 x 1/4 + 1/2 x ¾
=1/8+3/8=4/8=1/2
b) 4/5 x 1/2 - 1/2 x ¼
4/10-1/8=11/40
a, \(\dfrac{1}{2}\times\left(\dfrac{1}{4}+\dfrac{3}{4}\right)=\dfrac{1}{2}\times\dfrac{4}{4}=\dfrac{1}{2}\times1=\dfrac{1}{2}\)
b, \(\dfrac{1}{2}\times\left(\dfrac{4}{5}-\dfrac{1}{4}\right)=\dfrac{1}{2}\times\left(\dfrac{16}{20}-\dfrac{5}{20}\right)=\dfrac{1}{2}\times\dfrac{11}{20}=\dfrac{11}{40}\)
`a)1/2xx1/4+1/2xx3/4=1/2xx(1/4+3/4)=1/2xx4/4=1/2`
`b)4/5xx1/2-1/2xx1/4=1/2xx(4/5-1/4)=1/2xx(16/20-5/20)=1/2xx11/20=11/40`
a) 1/2 x 1/4 + 1/2 x 3/4
= \(\dfrac{1}{2}\)x ( \(\dfrac{1}{4}+\dfrac{3}{4}\))
= \(\dfrac{1}{2}\)x 1
= \(\dfrac{1}{2}\)
b) 4/5 x 1/2 - 1/2 x 1/4
= \(\dfrac{1}{2}\)x (\(\dfrac{4}{5}-\dfrac{1}{4}\))
= \(\dfrac{1}{2}\)x \(\dfrac{11}{20}\)
= \(\dfrac{11}{40}\)
a) \(\dfrac{1}{2}\times\dfrac{1}{4}+\dfrac{1}{2}\times\dfrac{3}{4}=\dfrac{1}{2}\times\left(\dfrac{1}{4}+\dfrac{3}{4}\right)=\dfrac{1}{2}\times1=\dfrac{1}{2}\)
b) \(\dfrac{4}{5}\times\dfrac{1}{2}-\dfrac{1}{2}\times\dfrac{1}{4}=\left(\dfrac{4}{5}-\dfrac{1}{4}\right)\times\dfrac{1}{2}=\dfrac{11}{20}\times\dfrac{1}{2}=\dfrac{11}{40}\)
