20/45 - ( 2/3 - 10 )
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20/45 - (2/3 x 10) x 45
=20/45 - 20/3 x 45
=20/45 - 300
= -2696/9
\(B=\dfrac{1}{2}+\dfrac{3}{10}+\dfrac{4}{45}+\dfrac{11}{180}+\dfrac{1}{20}\)
\(B=\dfrac{90}{180}+\dfrac{54}{180}+\dfrac{16}{45}+\dfrac{11}{180}+\dfrac{9}{180}\)
\(B=\dfrac{90+54+16+11+9}{180}\)
\(B=\dfrac{180}{180}\)
\(B=1\)
a:=5/4-3/4=2/4=1/2
b: =2/3-2/5=10/15-6/15=4/15
c: =10/12-9/12=1/12
d: =4/3-1/4=16/12-3/12=13/12
\(a,\dfrac{20}{16}-\dfrac{3}{4}=\dfrac{5}{4}-\dfrac{3}{4}=\dfrac{2}{4}=\dfrac{1}{2}\\ b,\dfrac{30}{45}-\dfrac{2}{5}=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{10}{15}-\dfrac{6}{15}=\dfrac{4}{15}\\ c,\dfrac{10}{12}-\dfrac{3}{4}=\dfrac{5}{6}-\dfrac{3}{4}=\dfrac{10}{12}-\dfrac{9}{12}=\dfrac{1}{12}\\ d,\dfrac{12}{9}-\dfrac{1}{4}=\dfrac{4}{3}-\dfrac{1}{4}=\dfrac{16}{12}-\dfrac{3}{12}=\dfrac{13}{12}\)
\(=\frac{20}{45}+\frac{32}{3}.45\)
\(=\frac{20}{45}+480\)
\(=\frac{4324}{9}\)
tíc mình nha
\(\dfrac{20}{45}-\left(\dfrac{2}{3}-10\right)=\dfrac{4}{9}-\left(\dfrac{2-30}{3}\right)=\dfrac{4}{9}-\left(-\dfrac{28}{3}\right)=\dfrac{4}{9}+\dfrac{28}{3}=\dfrac{4}{9}+\dfrac{84}{9}=\dfrac{88}{9}\)
20/45-(2/3-10)
=20/45-(2/3-10/1)
=20/45-28/3=167/135