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

Toán Lớp 8: Need helppppppp Tìm x , biết a.6x ( 5x + 3 ) + 3x ( 1 – 10x ) = 7 b.( 3x – 3 )( 5 – 24x ) + ( 7x + 4 )( 9x – 5 ) = 44 c.( x + 1 )( x +

Toán Lớp 8: Need helppppppp
Tìm x , biết
a.6x ( 5x + 3 ) + 3x ( 1 – 10x ) = 7
b.( 3x – 3 )( 5 – 24x ) + ( 7x + 4 )( 9x – 5 ) = 44
c.( x + 1 )( x + 2 )( x + 5 ) – $x^{2}$ ( x + 8 ) = 27
d.( -2x + 3 )( $x^{2}$ + 11 ) + $x^{2}$ ( 2x + 13 ) = 0

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    $a) 6x(5x+3)+3x(1-10x)=7$
    $⇔30x²+18x+3x-30x²=7$
    $⇔21x=7$
    $⇔x=1/3$
    $c) (x+1)(x+2)(x+5)-x²(x+8)=27$
    $⇔(x²+2x+x+2)(x+5)-x²-8x²=27$
    $⇔x³+5x²+2x²+10x+x²+5x+2x+10-x²-8x²=27$
    $⇔17x-17=0$
    $⇔17x=17$
    $⇔x=1$
    $d) (-2x+3)(x²+11)+x²(2x+13)=0$
    $⇔-2x³-22x+3x²+33+2x³+13x²=0$
    $⇔16x²−22x+33=0$
    $⇔16x²-22x=-33$
    $⇔-6x³=-33$
    $⇔x=11/2$
          Chúc bn hc tốt????
                $\text{#LinhSad}$
     
     

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