a/   100 . 37 + 37. 37 + 200 . 63 - 63 . 63\

  =  37 .[ 100+ 37 ]   + 63 . [ 200 - 63 ]  

  =    37. 137             +  63 . 137 

  =    137. [ 37 + 63 ] 

  =   137 . 100 = 13700

b/  84 + 14 .6 + 7 . 12 + 21. 4 + 3.28 

=  84 + 84 +  84 + 84 +84

= 84. 5 = 420 

[ dấu " ." là " x" nha ] đừng quên tích cho tui 

a, 13700

=12/37 nha 

nhớ cho mình nha!

A, 2 x 26 x 5 =( 5 x 2) x 26

10 x 26

=260                   

 b,4 x 37 x 25 =( 4 x 25) x 26

= 100 x 26

= 3700           

 c, 25 x 5 x 4 x 27 x 2 =( 25 x 4 ) x ( 2x 5) x 27

= 100 x 10 x 27 

= 1000x 27 

=27000

d,28 x 64 + 28 x 36 = 28 x ( 64 + 36 )

= 28 x 100

=2800

 e, 769 x 85 - 769 x 75  = 769 x ( 85 - 75 )

=769 x 10

=7690

f, 56 x 37 + 56 x 63 = 56 x ( 37 + 63 )

= 56 x 100

=5600

a. = 26 x (2 x 5)

   = 26 x 10 =260

b.=( 25x4) x37

   =100 x37=3700

c.=(25x4) x(5x2) x27

   =100 x10 x27

   = 27000

d.=28 x( 64+36)

   =28 x100

  = 2800

e.=769 x( 85-75)

    =769 x10 =7690

f. =56 x(37 +63)

  =56 x100

= 5600

a,\(32-x=-78\)

\(\Leftrightarrow x=32-\left(-78\right)\)

\(\Leftrightarrow x=110\)

b,\(12+x=-37\)

\(\Leftrightarrow x=-37-12\)

\(\Leftrightarrow-49\)

c,\(-63-x=-18\)

\(\Leftrightarrow x=-63-\left(-18\right)\)

\(\Leftrightarrow x=-45\)

d,\(35-75-x=15\)

\(\Leftrightarrow-40-x=15\)

\(\Leftrightarrow x=-40-15\)

\(\Leftrightarrow x=-55\)

e,\(63-x=-37\)

\(\Leftrightarrow x=63-\left(-37\right)\)

\(\Leftrightarrow x=100\)

Mik cần gấp!!!

Mấy bn giúp nhanh đơn mik nha!

b) 25.(37+5) -63.(-25)+5.(-125)

= 25.42+63.25+5.25.(-5)

= 25.[42+25+5.(-5)]

= 25.[42+25-25]

= 25.42

=1050

c) 31 . (-18)+ 31.(-81)-31

= 31.(-18)+31.(-81)+31.(-1)

= 31.[-18+(-81)+(-1)]

= 31.(-100)

= -3100

bạn viết đề các dấu ở số dính vào nhau ko đọc đc

Ta có:

37.41+37.63-63.37+63.41

=41(37+63)

=41.100

=4100

Ta có:

20-5x=15+6x-6

<=>20-5x-15-6x+6=0

<=>11-11x=0

<=>11x=11

<=>x=1

Vậy x=1

a: \(\frac{x+1}{65}+\frac{x+2}{64}=\frac{x+3}{63}+\frac{x+4}{62}\)

=>\(\frac{x+1}{65}+1+\frac{x+2}{64}+1=\frac{x+3}{63}+1+\frac{x+4}{62}+1\)

=>\(\frac{x+66}{65}+\frac{x+66}{64}=\frac{x+66}{63}+\frac{x+66}{62}\)

=>\(\left(x+66\right)\left(\frac{1}{62}+\frac{1}{63}-\frac{1}{64}-\frac{1}{65}\right)=0\)

=>x+66=0

=>x=-66

b: \(\frac{x-12}{77}+\frac{x-11}{78}=\frac{x-74}{15}+\frac{x-72}{17}\)

=>\(\frac{x-12}{77}-1+\frac{x-11}{78}-1=\frac{x-74}{15}-1+\frac{x-72}{17}-1\)

=>\(\frac{x-89}{77}+\frac{x-89}{78}=\frac{x-89}{15}+\frac{x-89}{17}\)

=>\(\left(x-89\right)\left(\frac{1}{15}+\frac{1}{17}-\frac{1}{77}-\frac{1}{78}\right)=0\)

=>x-89=0

=>x=89

a ) bằng 0.

b ) bằng 65.

a. (45-63+18) x (1+2+3+4+5+6+7+8+9)

= 0 x (1+2+3+4+5+6+7+8+9) = 0

b. 60-61+62-63+64-65+66-67+68-69+70

= 60 + (-61-69)+(62+68)+(-63-67)+(64+66)-65+70

= 60 + (-130)+130+(-130)+130-65-70

= 60 + (-130+130) + (-130+130)-65+70

= 60 - 65 + 70 = 65