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a) mk chỉnh lại đề nhé, nếu đúng thì tham khảo:
\(\frac{75}{100}+\frac{3}{4}\times29+75\%\times30+0,75\times40\)
\(=\frac{75}{100}+\frac{75}{100}\times29+\frac{75}{100}\times30+\frac{75}{100}\times40\)
\(=\frac{75}{100}\left(1+29+30+40\right)\)
\(=\frac{75}{100}\times100=75\)
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7,2.2+3.3,6+14,4.3-10,8
=(7,2.2+14,4.3)+(3.3,6-10,8)
=(14,4+14,4.3)+(10,8-10,8)
=14,4.(1+3)+0
=57,6
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3,6 x 25,8 + 50,8 x 3,6 + 7,2 x 11,7
= 3,6 x 25,8 + 50,8 x 3,6 + 3,6 x 2 x 11,7
= 3,6 x 25,8 + 50,8 x 3,6 + 3,6 x 23,4
= 3,6 x ( 25,8 + 50,8 + 23,4 )
= 3,6 x 100
= 360
k minh nhe minh trả loi nhanh nhat va dung nhat , day du nhat .
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a: =105,546+23,535=129,081
b: =16,2-6,2=10
c: =[10,5-5,5]:2,5
=5:2,5=2
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a) (1,5+8,5)+(2,5+7,5)+(3,5+6,5)+(4,5+5,5)
= 10+10+10+10
= 40
b) (4,03+3,97)+(0,73+5,47)
= 8+ 6,2
=14,2
c) (1,82+5,28)+(5,36+7,64)
= 7,1+13
= 20,1
a) 1,5 + 2,5 + 3,5 + 4,5 + 5,5 + 6,5 + 7,5 + 8,5 = (1,5 + 8,5) + (2,5 + 7,5) + ... + (4,5 + 6,5) + 5,5
= 10 + 10 + 10 + 10 + 5,5
= 45,5
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2008 x ( 0,4 - 3 :7,5 )
---------------------------
2008 x 2009
2008 x ( 0,4 - 0,4 )
----------------------------
2008 x 2009
2008 x 0 1
------------------=-----------
2008 x 2009 2009
3,6 * 7,5 + 5,5 * 7,2 + 0,036 * 8150 = 360