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a) 2459 - ( 400 + 459 )
= 2459 - 400 - 459
= 2000 - 400
= 1600
b) 435 x 25 +76 x 435 - 435
= 435 x 25 + 76 x 435 - 435 x 1
= 435 ( 25 + 76 - 1 )
= 435 x 100
= 43500
c) 36 x 49 + 51 x 36
= 36 ( 49 + 51 )
= 36 x 100
= 3600
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\(\frac{10}{15}=\frac{34}{51}=\frac{36}{54}\)
\(\frac{15}{20}=\frac{51}{68}=\frac{54}{72}\)
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Bài 1:
a: 6/9=2/3
6/24=1/4
48/96=1/2
42/98=3/7
b: 24/36=2/3
18/30=3/5
15/120=1/8
80/240=1/3
c: 5/25=1/5
75/100=3/4
64/720=4/45
16/1000=2/125
Bài 2:
Các phân số bằng 2/3 là 34/51; 20/30; 84/126
Bài 1 :
a) 6/9 = 2/3 ; 6/24 = 1/4 ; 48/96 = 1/2 ; 42/98 = 3/7
b) 24/36 = 2/3 ; 18/30 = 3/5 ; 15/120 = 1/8 ; 80 / 240 = 1/3
c) 5 / 25 = 1/5 ; 75/100=3/4 ; 64/720=4/45 ; 16/1000=2/125
Bài 2 :
Các phân số bằng 2/3 là :
\(\text{34/51; 20/30; 84/126}\)
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25+36+14+83+51+67+29+35
=(25+35)+(36+14)+(83+67)+(51+29)
=60+50+140+80
=(140+60)+(80+50)
=200+130
=330
=(25+35)+(36+14)+(83+67)+(51+29)
=60+50+140+80
=(140+60)+50+80
=200+50+80
=250+80
=330
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24+25+35+23+57+36=
=(24+36)+(25+35)+(23+57)
=60+60+80
=120+80
=200
24+25+35+23+57+36
= ( 24 + 36 ) + ( 25 + 35 ) + ( 23 + 57 )
= 60 + 60 + 80
= 120 + 80
= 200
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\(\dfrac{51}{50};\dfrac{27}{26};\dfrac{25}{24};\dfrac{18}{17};\dfrac{4}{3}\)
\(\dfrac{51}{50}< \dfrac{27}{26}< \dfrac{25}{24}< \dfrac{26}{25}< \dfrac{18}{17}< \dfrac{4}{3}\)
=227
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ủng hộ nha!
=227
k mk nha pạn!