a)

`1/3+3/4+2/3+1/4`

`=1/3+2/3+3/4+1/4`

`=1+1`

`=2`

b)

`3/4+3/5+2/8+4/10`

`=3/4+2/8+3/5+4/10`

`=6/8+2/8+6/10+4/10`

`=1+1`

`=2`

c)

`1/10+2/10+3/10+4/10+5/10+6/10+7/10+8/10+9/10`

`=1/10+9/10+2/10+8/10+3/10+7/10+6/10+4/10+5/10`

`=1+1+1+1+5/10`

`=4+5/10`

`=40/10+5/10`

`=45/10=9/2`

a: =1/3+2/3+3/4+1/4

=1+1

=2

b: =3/4+1/4+3/5+2/5

=1+1

=2

c: =(1+2+3+4+5+6+7+8+9)/10

=45/10

=9/2

a) 

(1/3-1/5)x1/4 = 1/3x1/4-1/5x1/4=1/12-1/20=1/30

(1/3-1/5)x1/4 = 2/15x1/4=1/30

b)

2/5 x 3/7 + 2/5 x 4/7= 6/35 + 8/35 = 14/35 = 2/5

2/5 x 3/7 + 2/5 x 4/7= (3/7+4/7) x 2/5 = 1 x 2/5 = 2/5

a: C1: (1/3-1/5)*1/4

=2/15*1/4=2/60=1/30

C2: (1/3-1/5)*1/4

=1/3*1/4-1/5*1/4

=1/12-1/20=1/30

b: C1: 2/5*3/7+2/5*4/7

=6/35+8/35=14/35=2/5

C2: 2/5*3/7+2/5*4/7

=2/5(3/7+4/7)

=2/5*1=2/5

A) 5/4 x X = 3/8 + 5/12

5/4 x X = 19/24

        X  = 19/24 : 5/4

        X  = 19/30

vậy x =...

B, 3 x 7/10 + 7/10 x 5 + 2 x 7/10

  = 7/10 x ( 3 + 5 + 2)

  = 7/10 x 10

  = 7

Giúp tớ với mọi người ơi

b)

1 + 9 = 10     2 + 8 = 10     3 + 7 = 10     4 + 6 = 10     5 + 5 = 10

10 - 1 = 9     10 - 2= 8     10 - 3 = 7     10 - 4 = 6     10 - 5 = 5

10 - 9 = 1     10 - 8 = 2     10 - 7 = 3     10 - 6 = 4     10 - 0 = 10

A)2¹⁰:2⁸

C1:  2¹⁰:2⁸=1024:256

=4

C2:  2¹⁰:2⁸=2^10-8=2²=4

B)4^6:4³

C1:   4^6:4³=4096:64=64

C2:   4^6:4³=4^6-3=4³=64

C)8⁵:8⁴

C1:   8⁵:8⁴=32768:4096=8

C2    8⁵:8⁴=8^5-4=8¹=8

D)7^4:7⁴

C1:    7^4:7⁴=2401:2401=1

C2    7^4:7⁴=7^4-4=7⁰=1

a) \(C1:2^{10}\div2^8=2^{10-8}=2^2=4\)

    \(C2:2^{10}\div2^8=1024\div256=4\)

b) \(C1:4^6\div4^3=4^{6-3}=4^3=64\)

    \(C2:4^6\div4^3=4096\div64=64\)

c) \(C1:8^5\div8^4=8^{5-4}=8^1=8\)

     \(C2:8^5\div8^4=\left(2^3\right)^5\div\left(2^3\right)^4=2^{15}\div2^{12}=2^{15-12}=2^3=8\)

d) \(C1:7^4\div7^4=1\)

     \(C2:7^4\div7^4=2401\div2401=1\)

a) \(C1:2^{10}\div2^8=2^{10-8}=2^2=4\)

\(C2:2^{10}\div2^8=1024\div256=4\)

b) \(C1:4^6\div4^3=4^{6-3}=4^3=64\)

\(C2:4^6\div4^3=4096\div64=64\)

c) \(C1:8^5\div8^4=8^{5-4}=8^1=8\)

\(C2:8^5\div8^4=\left(2^3\right)^5\div\left(2^3\right)^4=2^{15}\div2^{12}=2^{15-12}=2^3=8\)

d) \(C1:7^4\div7^4=1\)

\(C2:7^4\div7^4=2401\div2401=1\)

Hk tốt

/:)))

???

Jjj

a) \(\dfrac{3}{5}:\left(\dfrac{7}{11}+\dfrac{4}{11}\right)=\dfrac{3}{5}.1=\dfrac{3}{5}\)

 c2: \(\dfrac{7}{11}:\dfrac{3}{5}+\dfrac{4}{11}:\dfrac{3}{5}=\dfrac{7}{11}.\dfrac{5}{3}+\dfrac{4}{11}.\dfrac{5}{3}=\dfrac{3}{5}\)

a) 

C1: \(\dfrac{7}{11}:\dfrac{3}{5}+\dfrac{4}{11}:\dfrac{3}{5}=\left(\dfrac{7}{11}+\dfrac{4}{11}\right):\dfrac{3}{5}=1:\dfrac{3}{5}=\dfrac{5}{3}\)

Lời giải chi tiết

10        10       10    10       10      10     10     10    10      5     9     8     7     6   10    1     2     3    4    0

9+1+1+6+0+9+8+7+6+7+6+9+7+54+90+87+890=?

1 + 9 = 10     2 + 8 = 10     3 + 7 = 10     4 + 6 = 10     5 + 5 = 10

10 - 1 = 9     10 - 2 = 8     10 - 3 = 7     10 - 4 = 6     10 - 5 = 5

6 + 4 = 10     7 + 3 = 10     8 + 2 = 10     9 + 1 = 10     10 + 0 = 10

10 - 6 = 4     10 - 7 = 3     10 - 8 = 2     10 - 9 = 1     10 - 0 = 10

=10 , =9,8,7,6,5, =10

1 + 9 = 10     2 + 8 = 10     3 + 7 = 10     4 + 6 = 10     5 + 5 = 10

10 - 1 = 9     10 - 2 = 8     10 - 3 = 7     10 - 4 = 6     10 - 5 = 5

6 + 4 = 10     7 + 3 = 10     8 + 2 = 10     9 + 1 = 10     10 + 0 = 10

10 - 6 = 4     10 - 7 = 3     10 - 8 = 2     10 - 9 = 1     10 - 0 = 10