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a: x-4/5=3/7
=>x=3/7+4/5=43/35
b: x+3/7=4/5
=>x=4/5-3/7=13/35
c: 19/20-x=8/5-3/4
=>19/20-x=32/20-15/20=17/20
=>x=2/20=1/10
d: =>4/5*x=2/21
=>x=2/21:4/5=5/42
e: =>x:7/9=6/8
=>x=6/8*7/9=3/4*7/9=21/36=7/12
f: =>x/6=2/3-1/3=1/3
=>x=2
a: x-4/5=3/7
=>x=3/7+4/5=43/35
b: x+3/7=4/5
=>x=4/5-3/7=13/35
c: 19/20-x=8/5-3/4
=>19/20-x=32/20-15/20=17/20
=>x=2/20=1/10
d: =>4/5*x=11/21
=>x=55/84
e: =>x=6/8*7/9=42/72=7/12
f: =>x/6=2/3-1/3=1/3
=>x=2
\(\frac{2}{3}=\frac{2.6}{3.6}=\frac{12}{18}\)
\(\frac{14}{56}=\frac{14:14}{56:14}=\frac{1}{4}\)
\(\frac{24}{36}=\frac{24:3}{36:3}=\frac{8}{12}\)
\(\frac{x}{152}=\frac{2}{5}\Rightarrow x.5=2.152\Rightarrow x.5=304\Rightarrow x=304:5=60,8\)
a)\(\frac{2}{3}=\frac{12}{x}\Rightarrow12\times3=2x\)
=>36=2x
=>x=18
b)\(\frac{14}{56}=\frac{1}{4}=\frac{1}{x}\Rightarrow4=x\)
=>x=4
c)\(\frac{24}{36}=\frac{2}{3}=\frac{x}{12}\Rightarrow12\times2=3x\)
=>24=3x
=>x=8
d)\(\frac{x}{152}=\frac{2}{5}\Rightarrow2\times152=5x\)
=>304=5x
=>x=\(\frac{304}{5}\)
\(a)\frac{2}{3}=\frac{12}{x}\)
\(\Rightarrow2\cdot x=12\cdot3\)
\(\Rightarrow2\cdot x=36\)
\(\Rightarrow x=36:2=18\)
Vậy x = 18
\(b)\frac{24}{36}=\frac{x}{12}\)
Rút gọn : \(\frac{24}{36}=\frac{24:12}{36:12}=\frac{2}{3}\)
\(\Rightarrow\frac{2}{3}=\frac{x}{12}\)
\(\Rightarrow2\cdot12=x\cdot3\)
\(\Rightarrow x=\frac{2\cdot12}{3}=8\)
Vậy x = 8
\(c)\frac{14}{56}=\frac{1}{x}\)
Rút gọn : \(\frac{14}{56}=\frac{14:14}{56:14}=\frac{1}{4}\)
\(\Rightarrow\frac{1}{4}=\frac{1}{x}\)
\(\Rightarrow x=4\)
Vậy x = 4
\(d)\frac{x}{125}=\frac{2}{5}\)
\(\Rightarrow x\cdot5=2\cdot125\)
\(\Rightarrow x\cdot5=250\)
\(\Rightarrow x=250:5=50\)
Vậy x = 50
a)1440:40 =36
b)205 x 13 =2665
c)2057
d)36 x 25 x 4 =3600
18 x 24 :9 =48
41 x 2 x 8 x 5 =3280
215 x 86 + 215 x 14 =21500
53 x 128 - 43 x 128 =1408
2/3 x 4/7 =8/21
2 x 3 x 4 / 2 x 3 x 4 x 5 =24/120
1 x 2 x 3 x 4 / 5 x 6 x 7 x 8=24/1680
x : 7/11 = 22
x =22 x 7/11
x =14
2/7 * x =2/3
x = 2/7 :2/3
x = 20/21
a: 2/3=12/x
=>12/x=2/3
hay x=18
b: =>x/12=2/3
hay x=8
c: =>1/x=1/4
hay x=4
d: =>x/125=2/5
nên x=50
a, \(\dfrac{12}{18}=\dfrac{12}{x}\Rightarrow x=18\)
b, \(\dfrac{24}{36}=\dfrac{3x}{36}\Rightarrow3x=24\Leftrightarrow x=8\)
c, \(\dfrac{14}{56}=\dfrac{14}{14x}\Rightarrow14x=56\Leftrightarrow x=4\)
d, \(\dfrac{x}{125}=\dfrac{50}{125}\Rightarrow x=50\)
1. 444 x 5 = 222 x 2 x 5 = 222 x 10 = 2220
a.Đúng b.Sai
2. 282 x 5 = 280 + 2 x 5 = 280 x 10 = 2800
a.Đúng b. Sai
3. 4 x 8 x 7 x 25 = (8 x 7) x (25 x4) = 56 x 100 = 5600
a.Đúng b.Sai
4. 25 x 8 x 9 = (25 x 4) x (4 x 9) = 100 x 36 = 3600
a.Đúng b.Sai
1. A) 225886 + 779 × 8
= 225886 + 6232
= 232118
B) 125 × 5 × 20 × 8
= (125 × 8) × (5 × 20)
= 1000 × 100
= 100000
C) 47286 : 2 + 14765
= 23643 + 14765
= 38408
D) 91428 - 23560 : 5
= 91428 - 4712
= 86716
3. A) 36 × 532 + 63 × 532 + 532
= 532 × (36 + 63 + 1)
= 532 × 100
= 53200
B) 679 × 123 + 679 - 679 × 24
= 679 × (123 + 1 - 24)
= 679 × 100
= 67900
C) 245 × 327 - 245 × 18 - 9 × 245
= 246 × (327 - 18 - 9)
= 245 × 300
= 73500
Ta có:
a) ( 45 – 5 x 9 ) x 1 x 2 x 3 x 4 x 5 x 6 x 7
= (45 – 45) x 1 x 2 x 3 x 4 x 5 x 6 x 7
= 0 x 1 x 2 x 3 x 4 x 5 x 6 x 7
= 0
b) (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10) x (72 – 8 x 8 – 8)
= (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10) x (72 – 64 – 8)
= (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10) x 0
= 0
c) (36 – 4 x 9) : (3 x 5 x 7 x 9 x 11)
= (36 – 36) : (3 x 5 x 7 x 9 x 11)
= 0 : (3 x 5 x 7 x 9 x 11)
= 0
d) (27 – 3 x 9) : 9 x 1 x 3 x 5 x 7
= (27 – 27) : 9 x 1 x 3 x 5 x 7
= 0 : 9 x 1 x 3 x 5 x 7
=0
a) ( 45 – 5 x 9 ) x 1 x 2 x 3 x 4 x 5 x 6 x 7
= 0 x 1 x 2 x 3 x 4 x 5 x 6 x 7
b) (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10) x (72 – 8 x 8 – 8)
= (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10) x 0
c) (36 – 4 x 9) : (3 x 5 x 7 x 9 x 11)
= 0 : (3 x 5 x 7 x 9 x 11)
d) (27 – 3 x 9) : 9 x 1 x 3 x 5 x 7
= 0 : 9 x 1 x 3 x 5 x 7 Nếu đúng thì k cho mình nhé bạn!