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450x0,45 + 1,5x30x3 + 5x9x2,5
= 450x0,45 + 4,5x30 + 45x2,5
= 450x0,45 + 0,45x300 + 0,45x250
= 0,45x(450 + 300 + 250) = 0,45x1000 = 450
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12,98*55+12,98*44+12,98
=12,98*(55+44+1)
=12,98*100
=1298
Học tốt
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4 + 40 + 6 + 60 + 10 x 5
= (4 + 6) + (40 + 60) + 50
= 10 + 100 + 50
= 110 + 50
= 160
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10 x 5 + 5 x 10
c1 : 10 x (5 + 5)
= 10 x 10
= 100
c2 : (10 + 10) x 5
= 20 x 5
= 100
50 + 10 + 90 + 50 + 30 + 60 + 10 + 70 + 50 + 50
c1 : (50 + 50) + (10 + 90) + (30 + 60 + 10) + (50 + 50) + 70
= 100 + 100 + 100 + 100 + 70
= 100 x 4 + 70
= 400 + 70
= 470
c2: 50 x 4 + (10 + 90) + (70 + 30) + (60 + 10)
= 200 + 100 + 100 + 70
= 200 + 100 x 2 + 70
= 200 + 200 + 70
= 200 x 2 + 70
= 400 + 70 = 470
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60 - 26,75 - 13,25
= 60 - (26,75 + 13,25)
=60 - 40= 20
NHỚ CHO MÌNH NHA
60 - 26,75 - 13,25
= 60 - ( 26,75 + 13,25 )
= 60 - 40
= 20
Chúc bạn học tốt!
k mik nha!
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\(\frac{1}{10}+\frac{2}{20}+\frac{3}{30}+\frac{4}{40}+\frac{5}{50}+\frac{6}{60}+\frac{7}{70}+\frac{8}{80}+\frac{9}{90}\)
=\(\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}\)
=\(\frac{9}{10}\)
\(\frac{1}{10}+\frac{2}{20}+\frac{3}{30}+\frac{4}{40}+\frac{5}{50}+\frac{6}{60}+\frac{7}{70}+\frac{8}{80}+\frac{9}{90}=\frac{1}{10}+\frac{1}{10}+....+\frac{1}{10}=\frac{9}{10}\)
2/5 + 60% + 55% + 0,45
=2/5+3/5+11/20+9/20
=1+1=2
\(\frac{2}{5}+60\%+55\%+0,45\)
\(=0,4+0,6+0,55+0,45\)
\(=\left(0,4+0,6\right)+\left(0,55+0,45\right)\)
\(=1+1\)
\(=2\)