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a) 4,25 kg x 3 = 12.75 kg.
b) 5,8 cm2 x 3 + 5,8 cm2 x 2 = 5,8 cm2 x 5 = 29 cm2
c) 3,6 ha x 1 + 3,6 ha x 9 = 3,6 ha x 10 = 36 ha.
a)4.25kg*3=12.75kg
b)5.8m2+5.8m2*3+5.8m2=29m2
c)3.6ha+3.6ha*9=116.64ha
= 5.8m2 x 1 + 5.8cm2 x3 + 5.8cm2 x 1
= 5.8cm2 x ( 1+ 3+ 1)
=5.8cm2 x 5
=29 cm2
\(\left(\dfrac{3}{2.5}+\dfrac{3}{5.8}+...+\dfrac{3}{17.20}\right).x=\dfrac{45}{23}\)
\(\left(\dfrac{1}{2}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+....+\dfrac{1}{17}-\dfrac{1}{20}\right).x=\dfrac{45}{23}\)
\(\left(\dfrac{1}{2}-\dfrac{1}{20}\right).x=\dfrac{45}{23}\)
\(\dfrac{9}{20}\cdot x=\dfrac{45}{23}\)
\(x=\dfrac{45}{23}:\dfrac{9}{20}\)
\(x=\dfrac{100}{23}\)
\(\left(\dfrac{3}{2.5}+\dfrac{3}{5.8}+...+\dfrac{1}{17.20}\right)x=\dfrac{45}{23}\Leftrightarrow\left(\dfrac{1}{2}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+...+\dfrac{1}{17}-\dfrac{1}{20}\right)x=\dfrac{45}{23}\)\(\Leftrightarrow\left(\dfrac{1}{2}-\dfrac{1}{20}\right)x=\dfrac{45}{23}\)
\(\Rightarrow\dfrac{9}{20}.x=\dfrac{45}{23}\)
\(\Rightarrow x=\dfrac{100}{23}\)
= 5.8m2 x 1 + 5.8 m2 x 3 + 5.8 m2 x 1
= 5.8 m2 x(1+3+1)
= 5.8 m2 x 5=29 m2
5.8m2 + 5.8m2 * 3 + 5.8m2
= 5.8m2 *5
=29m2
k cho mk nhé