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5/3 - 3/4 + 7/12 = 20/12 - 9/12 + 7/12 = 18/12 = 3/2
5/6 : 2 x 18/7 = 5/6 x 1/2 x 18/7 = 90/84 = 15//14
\(x+\frac{2}{3}=2\frac{1}{2}\)
\(x+\frac{2}{3}=\frac{5}{2}\)
\(x=\frac{5}{2}-\frac{2}{3}\)
\(x=\frac{11}{6}\)
\(8,75.x+1,25.x=26,3\)
\(x.\left(8,75+1,25\right)=26,3\)
\(x.10=26,3\)
\(x=26,3\div10\)
\(x=2,63\)
1 :
2/3 ; 5/4 ; 1 ; 2/5 ; 1/3 = 2/3 ; 2/5 ; 1/3 ; 1 ; 5/4
2
a, 5/3 - 3/4 + 7/12 = 20/12 - 9/12 + 7/12 = 3/2
b, 5/6 : 2 x 18/7 = 5/6 x 1/2 x 18/7 = 15/14
k mình nhé
a. (45-63+18) x (1+2+3+4+5+6+7+8+9)
= 0 x (1+2+3+4+5+6+7+8+9) = 0
b. 60-61+62-63+64-65+66-67+68-69+70
= 60 + (-61-69)+(62+68)+(-63-67)+(64+66)-65+70
= 60 + (-130)+130+(-130)+130-65-70
= 60 + (-130+130) + (-130+130)-65+70
= 60 - 65 + 70 = 65
a. 8555/12
b.15/14
a)\(\dfrac{5}{3}-\dfrac{3}{4} +\dfrac{7}{12}=\dfrac{20}{12}-\dfrac{9}{12}+\dfrac{7}{12}=\dfrac{18}{12}=\dfrac{3}{2}\)
b)\(\dfrac{5}{6}:2\times\dfrac{18}{7}=\dfrac{5}{6}\times\dfrac{1}{2}\times\dfrac{18}{7}=\dfrac{5\times18}{6\times2\times7}=\dfrac{15}{14}\)