Tính nhanh
13/50 +90% + 41/100 + 24%
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a, \(\dfrac{90}{37}-\dfrac{38}{25}-\dfrac{8}{25}-\dfrac{4}{25}\)
= \(\dfrac{90}{37}\) - \(\dfrac{38+8+4}{25}\)
= \(\dfrac{90}{37}\) - 2
= \(\dfrac{16}{37}\)
\(\dfrac{24}{29}\) + \(\dfrac{32}{41}\) + \(\dfrac{34}{29}\) + \(\dfrac{50}{41}\)
=(\(\dfrac{24}{29}\) + \(\dfrac{34}{29}\)) + (\(\dfrac{32}{41}\) + \(\dfrac{50}{41}\))
= \(\dfrac{58}{29}\) + \(\dfrac{82}{41}\)
= 2 + 2
= 4
\(\frac{13}{50}+9\%+\frac{41}{100}+\frac{24}{100}\)
\(=\frac{26}{100}+\frac{9}{100}+\frac{41}{100}+\frac{24}{100}\)
\(=\frac{26+9+41+24}{100}=\frac{100}{100}=1\)
Trả lời
a)4/5.9/7-4/5.3/14
=4/5(9/7-3/14)
=4/5(18/14-3/14)
=4/5.15/14
=6/7
b)13/50+9%+41/100+24%
=13/50+9/100+41/100+24/100
=26+9+41+24/100
=(26+24)+(9+41)/100
=100/100
=1
\(\frac{4}{5}\cdot\frac{9}{7}-\frac{4}{5}\cdot\frac{3}{14}\)
=\(\frac{4}{5}\cdot(\frac{9}{7}-\frac{3}{14})\)
=\(\frac{4}{5}\cdot\frac{15}{14}\)
=\(\frac{6}{7}\)
b,\(\frac{13}{50}\)+9%+\(\frac{41}{100}\)+24%
=26%+9%+41%+24%
=100%=1
\(\dfrac{13}{45}\times\dfrac{15}{34}\times\dfrac{51}{91}\)
\(=\dfrac{13\times15\times51}{45\times34\times91}\)
\(=\dfrac{13\times15\times3\times17}{15\times3\times2\times17\times13\times7}\)
\(=\dfrac{1}{2\times7}\)
\(=\dfrac{1}{14}\)
B3:
a. =-1250000
b. =-20000
c. =0
d. =-24000
B4:
a. =-4100
b. =-2700
c. =400
d. =1007
13/50+9%+41/100+24%
=26/100+9/100+41/100+24/100
=26/100+24/100+9/100+41/100
=50/100+50/100
=100/100=1
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(\dfrac{13}{50}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{24}{100}\)
\(\dfrac{13}{50}+\left(\dfrac{9+41+24}{100}\right)\)
\(\dfrac{13}{50}+\dfrac{74}{100}\)
\(\dfrac{26}{100}+\dfrac{74}{100}=\dfrac{100}{100}=1\)
\(\frac{13}{50}+90\%+\frac{41}{100}+24\%\)
= \(\frac{26}{100}+\frac{90}{100}+\frac{41}{100}+\frac{24}{100}\)
= \(\left(\frac{26}{100}+\frac{24}{100}\right)+\frac{90}{100}+\frac{41}{100}\)
= \(\frac{50}{100}+\frac{90}{100}+\frac{41}{100}\)
= \(\frac{181}{100}\)
26%+90%+41%+24%=181%