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X/7=10/14 : X la 5
4/9=x/27 : x la 12
15/24=x/32: 15/24= 5/8: vậy X= 20
Tính nhanh:
=250
Tìm x:
x=4
x=1000
x=2
k minh di minh k lai cho giup minh khoi phuc lai diem am nha!!!!!
\(\left(\frac{3}{20}+\frac{1}{2}-\chi\right):\frac{32}{9}=\frac{21}{128}\)
\(\Rightarrow\left(\frac{3}{20}+\frac{10}{20}-\chi\right)=\frac{21}{128}\times\frac{32}{9}\)
\(\Rightarrow\frac{13}{20}-\chi=\frac{7}{12}\)
\(\Rightarrow\chi=\frac{13}{20}-\frac{7}{12}\)
\(\Rightarrow\chi=\frac{1}{15}\)
c,32+48:x=40 =>48:x=8=>x=48:8=>x=6
c1
a,3/15 = 3:3/15:3 = 15
33/44 = 33:11/44:11 = 34
2/8 = 2:2/8:2 = 1/4
b,9/12 =9:3/12:3 = 34
24/36 =24:12/36:12 = 23
3/8 = 3:1/8:1 = 3/8
c2
a) =12x(4+6)/24
= 12x10/24
=120/24
=5
b,16x8-16x2/12x4
=16x(8-2)/48
=16x6/48
=2
c3
5/8=45/72
20/15=4/3=96/72
24/32=3/4=54/72
15/18=5/6=60/72
77/99=7/9=56/72
c4
2/3=2/3
12/15=4/5
24/18=4/3
16/48=1/3
75/100=3/4
30/45=2/3
12/36=1/3
20/15=4/3
các phân số lớn hơn 1 luôn có mẫu số bé hơn tử số
vậy các số lớn hơn 1 là 24/18,20/15
k mk nha thank mọi ng'
a, \(\frac{3}{15}=\frac{1}{5}=\frac{4}{20}\); \(\frac{33}{44}=\frac{3}{4}=\frac{15}{20}\); \(\frac{2}{8}=\frac{1}{4}=\frac{5}{20}\)
b, \(\frac{9}{12}=\frac{3}{4}=\frac{18}{24}\); \(\frac{24}{36}=\frac{2}{3}=\frac{16}{24}\); \(\frac{3}{8}=\frac{9}{24}\)
Bài 2 :
a,\(\frac{12x4+12x6}{24}=\frac{12x\left(4+6\right)}{24}=\frac{1x10}{2}=\frac{10}{2}=\frac{5}{1}\)
b, \(\frac{16x8-16x2}{12}=\frac{16x\left(8-2\right)}{12}=\frac{8x6}{6}=\frac{8}{1}\)
A = \(\dfrac{8\times12\times32+4\times27\times24+96\times41}{16\times48-48\times9+4\times3\times12}\)
A = \(\dfrac{96\times32+96\times27+96\times41}{16\times48-48\times9+48\times3}\)
A = \(\dfrac{96\times\left(32+27+41\right)}{48\times\left(16-9+3\right)}\)
A = \(\dfrac{96\times100}{48\times10}\)
A = \(\dfrac{20}{1}\) \(\times\) \(\dfrac{48\times10}{48\times10}\)
A = 20
Câu 1: \(\frac{17}{51}\)x \(\frac{45}{30}\)= \(\frac{1}{3}\)x \(\frac{3}{2}\)
= \(\frac{1}{2}\).
Câu 2: \(\frac{24}{15}\)x \(\frac{56}{72}\)x \(\frac{10}{14}\)= \(\frac{8}{5}\)x \(\frac{7}{9}\)x \(\frac{5}{7}\)
= \(\frac{56}{45}\)x \(\frac{5}{7}\)
= \(\frac{8}{9}\)
Câu 3: \(\frac{32}{48}\times\frac{35}{21}\times\frac{63}{14}\times\frac{9}{30}=\frac{2}{3}\times\frac{5}{3}\times\frac{9}{2}\times\frac{3}{10}=\frac{3}{2}\)
k nha
a)17/51x45/40=1/3x3/2=3/6=1/2
b)24/15x56/72x10/14=8/5x7/9x5/7=8/9
c)32/48x35/21x63/14x9/30=2/3x5/3x9/2x3/10=3/2
1, (30 x 5 - 24 x 4) x 32 : (30 + 20)
= 54 x 32 : 50
= 1728 : 50
= 34,56
2, (12 x 6 + 108) x 15 + 135 : 45
= 180 x 15 + 135 : 45
= 2700 + 135 : 45
= 2700 + 3
= 2703
3, 807 + 49 x (311 - 4807 : 23)
= 807 + 49 x 102
= 807 + 4998
= 5805
4 , ( 4,72 + 3,57 x 4,1 + 8,5 x 2,434) x 100
= 40,046 x 100
= 4004,6
5, (23,79 : 7,8 - 6,8 : 417) x 3,04 - 2,04
= 2,65 x 3,04 - 2,04
= 8,056 - 2,04
= 6,016
C1:
a. 786 x ( 32 +68)
= 786 x 100
= 78600
b. 2904 x 15 + 2904 x 35
= 43560 + 101640
= 145200
c.436 x 72 - 436 x 42
= 31392 - 18312
= 13080
d.194 x (87-7)
= 194 x 80
=15520
e.3332 : (4x49)
= 3332 : 196
= 17
f. 72 : 9 : 8
= (72 : 9) :8
= 1
g. (15 x 24) : 6
= 360 :6
= 60
m. 25 x(36 :9)
= 25 x 4
= 100
Cách 2:
a.786 x 32 + 786 x 68
= 25152 + 53448
= 78600
b. 2904 x ( 15 + 35)
= 2904 x 50
= 145200
c.436 x (72 -42)
= 436 x 30
= 13080
d.194 x 87 - 194 x7
= 16878 - 1358
= 15520
e. 3332 : (4 x 49)
= 3332 : 4 : 49
= 833 : 49 = 17
f. 72 : 9 :8
= 72 : (9 x8)
= 72 : 72
=1
g. (15 x 24) :6
= 15 x (24 :6)
= 15 x 4
= 60
m. 25 x (36 :9)
= ( 25 x36 ):9
= 900 : 9
=100
20/32 = x + 9/24
x = 5/8 - 3/8
x = 1/4
\(\dfrac{20}{32}\)=x+\(\dfrac{9}{24}\)
=>x=\(\dfrac{20}{32}\)-\(\dfrac{9}{24}\)
=>x=\(\dfrac{20.3-9.4}{96}\)
=>x=\(\dfrac{60-36}{96}\)
==>x=\(\dfrac{24}{96}\)
=>x=\(\dfrac{1}{4}\)