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b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16
= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8
= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)
= 1 + 1 + 7/4
= 2 + 7/4 = 15/4
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16
= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2
= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2
= 14/7 + 12/6 + 5/8 + 1/2
= 2 + 2 + 5/8 + 1/2
= 4 + 9/8 = 41/8
9 X 8 X 35/ 25 X 9 X 32
= 3 X 3 X 4 X 2 X 5 X 7 / 5 X 5 X 3 X 3 X 4 X 2 X 4
= 7/20
NHỚ K MÌNH NHA!
\(\frac{9\times8\times35}{25\times9\times32}\)
\(=\frac{9\times8\times5\times7}{5\times5\times9\times8\times4}\)
\(=\frac{7}{5\times4}=\frac{7}{20}\)
1.3/2>5/5>3/4>2/3>3/5>2/5
2.135/120 = 9/8 = 18/16= 36/32
72/84 = 36/42 = 6/7 = 12/14
3. ( Rất tiếc mình làm không được!!! SORRY)
4.
4242x12x15/2121x15x20
= 2x12/20
= 24/20
= 6/5
HT
Bài 1:
\(\dfrac{2}{3}\) + \(\dfrac{3}{4}\) - \(\dfrac{2}{5}\)
=\(\dfrac{40}{60}\) + \(\dfrac{45}{60}\) - \(\dfrac{24}{60}\)
= \(\dfrac{61}{60}\)
b; \(\dfrac{12}{13}\) x \(\dfrac{3}{4}\) - \(\dfrac{7}{13}\)
= \(\dfrac{9}{13}\) - \(\dfrac{7}{13}\)
= \(\dfrac{2}{13}\)
c; \(\dfrac{15}{17}\) : \(\dfrac{19}{34}\) - \(\dfrac{17}{19}\)
= \(\dfrac{15}{17}\) x \(\dfrac{34}{19}\) - \(\dfrac{17}{19}\)
= \(\dfrac{30}{19}\) - \(\dfrac{17}{19}\)
= \(\dfrac{13}{19}\)
Bài 2:
a; \(\dfrac{x}{5}\) x \(\dfrac{3}{7}\) = \(\dfrac{9}{35}\)
\(\dfrac{x}{5}\) = \(\dfrac{9}{35}\) : \(\dfrac{3}{7}\)
\(\dfrac{x}{5}\) = \(\dfrac{3}{5}\)
\(x\) = \(\dfrac{3}{5}\) x 5
\(x\) = 3
( 11 x 9 - 100 +1 ) x ( 1 x 2 x ... x10 ) = (99 + 1 - 100) x 1 x 2 x .... x 10
= 0 x 1 x 2 x ....... x 10
= 0
Ta có
(11x9 -100+1)x (1x2x3x..x100)
= 0x ( 1x2x3x..x100)
=0
1) 1/2*1/6=1/12 ; 1/3*1/4=1/12. Ta có : 17/5+1/12*71/5-1/12*28/5=1/12*(17/5+71/5-28/5)=1/12*60/5=1/12*12=1 2)1/10+4/20+9/30+16/40+25/50 =1/10+2/10+3/10+4/10+5/10(rút gọn) =15/10=3/2 3)18/15*(2525/3636+1515/1818-2020/7272)=6/5*(25/36+5/6-5/18)(rút gọn)=6/5*25/36+6/5*5/6-6/5*5/18=5/6+1-1/3=9/6=3/2.
a) \(\frac{3}{5}+\frac{2}{7}\times\frac{7}{8}=\frac{3}{5}+\frac{2}{8}=\frac{3}{5}+\frac{1}{4}=\frac{12}{20}+\frac{5}{20}=\frac{17}{20}\)
b) \(1-\frac{3}{4}:\frac{5}{6}=1-\frac{3}{4}\times\frac{6}{5}=1-\frac{18}{20}=1-\frac{9}{10}=\frac{10}{10}-\frac{9}{10}=\frac{1}{10}\)
a) = 13 . (27 + 35 + 38)
= 13 . 80
= 1080
Mk chỉ làm đc câu a thôi!
học tốt ngen!!!
Bài 1: tính nhanh
a) 13 x 27 + 13 x 35 + 13 x 38
= 13 x ( 27 + 35 + 39 )
= 13 x 100
= 1300
P/S: tớ chỉ nhớ mỗi câu a còn câu b tớ quên mất rùi nên vô cung sorry Thư nghen. ^_^
a, 8 x 6/32 x 1/5 = 3/10
8 x 6/32 x 1/5 = 8 x 3/16 x 1/5 = 3/10
b, 15/16 x 36/35 x 28 = 27
a=3/10
b=27
chúc em học tốt OwO