Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: ( 3700 + 5300 ) – 5x = 1500 x-3 = 5 mũ 6 : 5 mũ 3 + 2 mũ 3 . 2 mũ 2 [ 2 ( 70 – x ) + 2 mũ 3 . 3 mũ 2 ] = 46 x + ( x + 1 ) + ( x + 2

Toán Lớp 6: ( 3700 + 5300 ) – 5x = 1500
x-3 = 5 mũ 6 : 5 mũ 3 + 2 mũ 3 . 2 mũ 2
[ 2 ( 70 – x ) + 2 mũ 3 . 3 mũ 2 ] = 46
x + ( x + 1 ) + ( x + 2 ) +……..+ (x + 30 ) = 1240
tìm x

Comments ( 2 )

  1. Giải đáp:
     $(3700+5300)-5x=1500$
    $9000-5x=1500$
    $5x=9000-1500$
    $5x=7500$
    $x=7500:5$
    $x=1500$
    Vậy x=1500
    $x-3=5^6:5^3+2^3.2^2$
    $x-3=5^3+2^5$
    $x-3=125+32$
    $x-3=157$
    $x=157+3$
    $x=160$
    Vậy x=160
    $[2(70-x)+2^3.3^2]=46$
    $140-2x+8.9=46$
    $140-2x+72=46$
    $140-2x=46-72$
    $140-2x=-26$
    $2x=140-(-26)$
    $2x=140+26$
    $2x=166$
    $x=166:2$
    $x=83$
    Vậy x=83
    $x+(x+1)+(x+2)+………+(x+30)=1240$
    $(x+0)+(x+1)+(x+2)+…….+(x+30)=1240$
    $\underbrace{(x+x+x+….+x)}_{31 số x}$$+(0+1+2+……+30)=1240$
    $31.x+[31.(30+0):2]=1240$
    $31.x+465=1240$
    $31.x=1240-465$
    $31.x=775$
    $x=775:31$
    $x=25$
    Vậy x=25
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    ( 3700 + 5300 ) – 5x = 1500
    9000 – 5x = 1500
                5x = 9000 – 1500
                5x = 7500
                  x = 7500 : 5
                  x = 1500
    _ _ _ _ _ 
    x – 3 = 5^6 : 5^3 + 2^3 . 2^2
    x – 3 = 5^3 + 2^5
    x – 3 = 125 + 32
    x – 3 = 157
    x = 157 + 3
    x = 160
    _ _ _ _ _ 
    [ 2 . ( 70 – x ) + 2^3 . 3^2 ] = 46
    140 – 2x + 72 = 46
    140 – 2x = 46 – 72
    140 – 2x = -26
              2x = 140 +26
              2x = 166
                x = 166 : 2
                x = 83
    _ _ _ _ _
    x + ( x + 1 ) + ( x + 2 ) +…………..+ ( x + 30 ) = 1240
    x . [(30-0):1+1] + [(30-1):1+1] . (30+1) : 2 = 1240
    x . 31 + 30 . 31 : 2 = 1240
    x . 31 + 930 : 2 = 1240
    x . 31 + 465 = 1240
    x . 31 = 1240 – 465
    x . 31 = 775
    x = 775 : 31
    x = 25

Leave a reply

222-9+11+12:2*14+14 = ? ( )