Tính nhanh:
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
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\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(=\dfrac{13}{50}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{6}{25}\)
\(=\dfrac{13}{50}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{12}{50}\)
\(=\left(\dfrac{13}{50}+\dfrac{12}{50}\right)+\left(\dfrac{9}{100}+\dfrac{41}{100}\right)\)
\(=\dfrac{25}{50}+\dfrac{50}{100}\)
\(=\dfrac{25}{50}+\dfrac{25}{50}\)
\(=\dfrac{50}{50}=1\)
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(=\dfrac{26}{100}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{24}{100}\)
\(=\left(\dfrac{26}{100}+\dfrac{24}{100}\right)+\left(\dfrac{9}{100}+\dfrac{41}{100}\right)\)
\(=\dfrac{50}{100}+\dfrac{50}{100}=\dfrac{1}{2}+\dfrac{1}{2}=\dfrac{2}{2}=1\)
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(=0,26+0,09+0,41+0,24\)
\(=\left(0,26+0,24\right)+\left(0,09+0,41\right)\)
\(=0,5+0,5\)
\(=1\)
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(=\dfrac{26}{100}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{24}{100}\)
\(=\left(\dfrac{26}{100}+\dfrac{24}{100}\right)+\left(\dfrac{9}{100}+\dfrac{41}{100}\right)\)
\(=\dfrac{1}{2}+\dfrac{1}{2}\)
\(=1\)
Bài 3
a,26/100+0,009+41/100+0,24
0,26+0,09+0,41+0,24
(0,26+0,24)+(0,09+0,41)
0,5+0,5
=1
b,9+1/4+6+2/7+7+3/5+8+2/3+2/5+1/3+5/7+3/4
(9+6+7+8)+(2/7+5/7)+(1/4+3/4)+(3/5+2/5)+(2/3+1/3)
30+1+1+1+1
=34
Bài 4,5 khó quá mik ko bít lamf^^))
Bài 4: a, \(\dfrac{2008}{2009}\) < 1; \(\dfrac{10}{9}\) > 1
\(\dfrac{2008}{2009}\) < \(\dfrac{10}{9}\)
b, \(\dfrac{1}{a+1}\) và \(\dfrac{1}{a-1}\)
Ta có: a + 1 > a - 1 ⇒ \(\dfrac{1}{a+1}\) < \(\dfrac{1}{a-1}\)
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(\dfrac{13}{50}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{24}{100}\)
\(\dfrac{13}{50}+\left(\dfrac{9+41+24}{100}\right)\)
\(\dfrac{13}{50}+\dfrac{74}{100}\)
\(\dfrac{26}{100}+\dfrac{74}{100}=\dfrac{100}{100}=1\)
= 26/100 + 9/100 + 41/100 + 24/100
= \(\dfrac{26+9+41+24}{100}=\dfrac{100}{100}=1.\)
Chúc bạn HT
tick mình nha!
mình ko ghi đề bài nha
=26%+9%+41%+24%
=(26%+24%)+(9%+41%)
=50%+50%
=100%
A = \(\dfrac{13}{50}\) + 9% + 41/100 + 0,24
A = 0,26 + 0,09 + 0,41 + 0,24
A = (0,26 + 0,24) + ( 0,09 + 0,41)
A = 0,5 + 0,5
A = 1
\(\frac{13}{50}+9\%+\frac{41}{100}+0,24\)
\(=\frac{13}{50}+\frac{9}{100}+\frac{41}{100}+\frac{24}{100}\)
\(=\frac{13}{50}+\left[\frac{9}{100}+\frac{41}{100}+\frac{24}{100}\right]\)
\(=\frac{13}{50}+\frac{74}{100}=\frac{13}{50}+\frac{37}{50}=1\)
đễ
=26%+9%+41%+24%
=(26%+24%)+(9%+41%)
=50%+50%
=100%
1
= 1