58 x 42 + 32 x 8 + 5 x 16 = 2772

kết quả là 2772

???

  58 x 42 + 32 x 8 + 5 x 16

= 116 x 21 + 16 x 16 + 5 x 16

= 116 x 21 + 16(16 + 5)

= 116 x 21 + 16 x 21

= 21 x ( 116 + 16 )

= 21x 132

= 2772

58*42+32*8+5*16

=58*42+2*16*8+5*16

=58*21*2+16*(2*8+5)

=58*21*2+16*21

=21*(58*2+16)

=21*(116+16)

=21*132

=2772

\(A=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}\)

\(2\times A=1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}\)

\(2\times A-A=\left(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}\right)-\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}\right)\)

\(A=1-\frac{1}{128}\)

\(A=\frac{127}{128}\)

\(B=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\)

\(2\times B=1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\)

\(B=1-\frac{1}{16}=\frac{15}{16}\)

\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)

\(\Leftrightarrow4\times x+\frac{15}{16}=1\)

\(\Leftrightarrow4\times x=\frac{1}{16}\)

\(\Leftrightarrow x=\frac{1}{64}\)

58*42+32*8+5*16

=2436+256+80

=2772

58x42+32x8+5x16

=2436+256+80

=2772 nha 

a. 64 x 25 + 35 x 25 + 25

= 64 x 25 + 35 x 25 + 25 x 1

= 25 x ( 64 + 35 + 1 )

= 25 x 100 

= 2500

b. 58 x 42 + 32 x 8 + 5 x 16

c. ( 42 x 43 + 57 x 43 + 43 ) - 360 : 4

= 42 x 43 + 57 x 43 + 43 x 1 - 90

= 43 x ( 42 + 57 +1 ) - 90

= 43 x 100 - 90

= 4300 - 90

= 4210

d. 456 : 2 x 181456 : 3 - 102

Trả lời:

a,\(64\times25+35\times25+25\)

\(=25\times\left(64+35+1\right)\)

\(=25\times100\)

\(=2500\)

b,\(58\times42+32\times8+5\times16\)

\(=2436+256+80\)

\(=2772\)

c,\(\left(42\times43+57\times43+43\right)-360\div4\)

\(=43\times\left(42+57+1\right)-90\)

\(=43\times100-90\)

\(=4300-90\)

\(=4210\)

d,\(456\div2\times181456\div3-102\)

\(=228\div3\times181456-102\)

\(=76\times181456-102\)

\(=13790656-102\)

\(=13790554\)

a)64x25+35x25+25=25x(64+35)+25=25x99+25=2475+25=2500

mình trả lời ý a

64 x 25 +35 x 25 +25 x 1

= 25 x ( 64 + 35 + 1 )
= 25 x 100

= 2500

Bài 2: Phân số này lớn hơn 1

chi ơi mày có biết làm ko

x - 5 / 6 = 12 / 7

       x    = 12 / 7 + 5 / 6

       x    = 107 / 42

x + 4 / 5 = 8 / 3

       x     = 8 / 3 - 4 / 5

       x     = 28 / 15

x * 3 / 9 = 11 / 7 - 3 / 4

x * 3 / 9 = 23 / 28

       x    = 23 / 28 : 3 / 9

       x    = 69 / 28

5 / 9 : x = 1 / 3 + 2 / 5

5 / 9 : x = 11 / 15

          x = 5 / 9 : 11 / 15

          x = 25 / 33

\(1\frac{3}{4}-x=\frac{3}{8}\)

              x    = 11 / 8

15 , 21 - x = 5 , 6 + 1 , 2

15 , 21 - x = 6 , 8

              x = 15 , 21 - 6 , 8

              x = 8 , 41

C1 : ( 6 , 75 + 3 , 25 ) * 42

= 10 * 42

= 420

C 2 : ( 6 , 75 + 3 , 25 ) * 42

= 6,75 * 42 + 3,25 * 42

= 283 , 5 + 136 , 5

= 4200

C 1 : ( 9 , 6 - 4 , 2 ) * 3 , 6

= 5 , 4 * 3 , 6

= 19 , 44

C 2 : ( 9 , 6 - 4 , 2 ) * 3 , 6

= 9 , 6 * 3 , 6 - 4 , 2 * 3 , 6

= 34 , 56 - 15 , 12

= 19 , 44