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5 + 5 + 5 + 5 + 5 + 5 + 10 + 15 + 10 + 10 + 10
= (5 x 6) + (10 x 4) + 15
= 30 + 40 + 15
= 85
5 + 5 + 5 + 5 + 5 + 10 + 15 + 5 + 10 + 10 + 10 = 85
k mik nha
\(85\)
\(5+5-5+5-5+5-5+10-10+10+10+10\)
\(=5+0+0+0+0+10+10+10\)
\(=5+10x3\)
\(=5+30\)
\(=35\)
\(10+10+5+5+5+5+10\)
\(=10+10+10+10+10\)
\(=10\cdot5\)
\(=50\)
\(\dfrac{7}{10}+3:10+\dfrac{2}{5}+1:10\\ =\left(\dfrac{7}{10}+\dfrac{2}{5}\right)+\left(3:10+1:10\right)\\ =\dfrac{11}{10}+\left(3+1\right)\times\dfrac{1}{10}\\ =\dfrac{11}{10}+4\times\dfrac{1}{10}\\ =\dfrac{11}{10}+\dfrac{2}{5}\\ =\dfrac{3}{2}\)
\(\dfrac{7}{10}+3:10+\dfrac{2}{5}+1:10\\ =\dfrac{7}{10}+\dfrac{3}{10}+\dfrac{2}{5}+\dfrac{1}{10}\\ =\left(\dfrac{7}{10}+\dfrac{3}{10}\right)+\left(\dfrac{2}{5}+\dfrac{1}{10}\right)\\ =\dfrac{10}{10}+\left(\dfrac{4}{10}+\dfrac{5}{10}\right)=\dfrac{10}{10}+\dfrac{5}{10}=\dfrac{15}{10}=\dfrac{3}{2}\)
10 + 5 + 10 + 5
= ( 10 + 10 ) + ( 5 + 5 )
= 20 + 10
= 30
a) 90 – ( 30 – 20) = 90 – 10
= 80
90 – 30 – 20 = 60 - 20
= 40
b) 100 – (60 + 10) = 100 – 70
= 30
100 - 60 + 10 = 40 + 10
= 50
c) 135 – (30 + 5) = 135 – 35
= 100
135 – 30 – 5 = 105 – 5
= 100
d) 70 + (40 – 10) = 70 + 30
= 100
70 + 40 – 10 = 110 -10
= 100
\(5+10+5+10+5+10=\left(5+5+5\right)+\left(10+10+10\right)=15+30=45\)
5 + 10 + 10 + 5 + 5 + 10 + 10 + 5
= (5 + 5) + (5 + 5) + 10 + 10 + 10 + 10
= 10 + 10 + 10 + 10 + 10 + 10
= 60
=60
k mk nha
m vừa k bn rùi đó!