4900 100000%

49x38+49x62

=49x(38+62)

=49x100=4900

=49x(38+62)

=4900

Ta có:

49 x 62 + 38 x 73 + 31 x 51 x 2 + 19 x 27 x 2

= 49 x 62 + 38 x 73 + 62 x 51 + 38 x 27

= 62 x ( 49 + 51 ) + 38 x ( 73 + 27 )

= 62 x 100 + 38 x 100

= ( 38 + 62 ) x 100

= 100 x 100

= 10 000

49x62+38x73+31x51x2+19x27x2

= 3038+2774+3162+1026

=10000

k cho mk nha bn!                    :)

tính nhanh thủy ạ

a) =49x62+62x51

 =62x(49+51)

 =62x100

 =6200

b)còn câu b =3724 nha

a , 49 x ( 37 + 25 ) + 62 x ( 121 - 70 )

= 49 x 62 + 62 x 51

= 62 ( 49 + 51 )

= 62 x 100

= 6200

b , 25 x 38 + 146 x 19

= 25 x 38 + 73 x 2 x 19

= 25 x 38 + 73 x 38

= 38 ( 25 + 73 )

= 38 x 98

= 3724

a. 38 762 + 49 363

+ 38762 49363      88125

b. 62 400 – 35 815

− 62400 35815      26585

a)    \(\left(-25\right).5.\left(-4\right).2\)

\(=\left[\left(-25\right).\left(-4\right)\right].\left(2.5\right)\)

\(=100.10=1000\)

b)   \(\left(-456\right)-\left(67-456\right)\)

\(=-456-67+456\)

\(=\left(456-456\right)-67\)

\(=67\)

a) ((-25).(-4)).5.2

=100.10

=1000

b) (-456)-67+456

=(-456)+(-67)+456

=0+-(-67)

=-67

c)78.45+-145.78

=78.(45+145)

=78.190

=Tự làm

a) (-25).5.(-4).2

= 5 . ( -4 ) . ( -25 ) . 2

= -20 . ( - 50 )

= 100

b) (-456) - (67 - 456)

= -456 - 67 + 456

= -456 + 456 - 67

= -67

c) 78.45+145.(-78)

= 78 . 45 + ( - 145 ) . 78

= 78 . ( -145 + 45 )

= 78 . 100

= 7800

d) 38.( 62-75) + 62.(-75 - 38)

= 38 . 62 - 38 . 75 + 62 . ( - 75 ) - 62 . 38

= 38 . 62 - 62 . 38 + 38 . 75 + 62 . ( - 75 )

= 0 + 38 . 75 + ( - 62 ) . 75

= 75 . ( - 62 + 38 )

= 75 . ( - 24 )

= - 1800

a) 125.(-4).(-8).7

= 125 . ( - 8 ) . ( - 4 ) . 7

= 1000 . ( - 28 )

= - 28000

c) 72.( 28 - 49) + 28. ( -49 - 72)

= 72 . 28 - 72 . 49 + 28 . ( - 49 ) - 28 . 72

= 72 . 28 - 28 . 72 + 72 . 49 + 28 . ( - 49 )

= 0 + 72 . 49 + ( - 28 ) . 49

= 49 . ( -28 + 72 )

= 49 . 44

= 2156

a) 37.(x-49)=0

x-49=0

x=49

b) (3x-26).38=38

3x-26 = 0

3x = 26

x = 26/3

c) (326-x).49=98

326-x=2

x=324

d)4.(x+7)=64

x+7 = 16

x = 9

49 x (37+25) + 62 x (121- 60)

= 49 x 62 + 62 x 61

= 62 x (49+61)

=6820

49*(37+25)+62*(121-60)

=49*62+62*61

=62*(49+61)

=62*110

=6820

49 x ( 37 + 25 ) + 62 x ( 121 - 60 )

= 49 x 62 + 62 x 61

= 3038 + 3728

= 6820

x - 38 + 27 = 82 - 49

x - 38 + 27 = 33

        x - 38 = 33 - 27

         x - 38 = 6

                x = 6 + 38

                x = 44

mik nhah nhất nha

x - 38 + 27 = 82 - 49

x - 11 = 33

x = 33 + 11

x = 44

x - 38 + 27 = 82 - 49

x - 38 + 27 = 33

x - 38         = 33 - 27

x - 38         = 6

x                = 6 + 38

x                = 44

 Vậy x = 44