Toán Lớp 6: tìm x a) 3.x-17=4-(-6) b)-15-x=4+(-8) c) x:(-3)=-18+(-3) d)-13+x=-48:(-4) e)2.x+16=-6+34

Question

Toán Lớp 6:  tìm x a) 3.x-17=4-(-6) b)-15-x=4+(-8) c) x:(-3)=-18+(-3) d)-13+x=-48:(-4) e)2.x+16=-6+34

giangnguyen33 · Answer

Giải đáp:    $a) 3.x-17=4-(=6)$   $&hArr; 3.x-17= 10$   $&hArr; 3.x= 10+17$   $&hArr; 3.x=27$   $&hArr; x=27:3$   $&hArr;x=9$   $Vậy$ $x=9$   $b) -15-x=4+(-8)$   $&hArr; -15-x= -4$   $&hArr; x= (-15)-(-4)$   $&hArr; x= -11$   $vậy$ $x=-11$   $c) x:(-3)=(-18)+(-3)$   $&hArr; x:(-3)=(-21)$   $&hArr; x= (-21).(-3)$   $&hArr; x= 63$   $vậy$ $x=63$   $d) -13+x=-48:(-4)$   $&hArr; -13+x= 12$   $&hArr; x= 12-(-13)$   $&hArr; x= 25$   $vậy$ $x=25$   $e) 2.x+16=-6+34$   $&hArr; 2.x+16= 28$   $&hArr; 2.x= 28-16$   $&hArr; 2.x= 12$   $&hArr; x=12:2$   $&hArr;x=6$   $vậy$ $x=6$

bichquyenlien · Answer

a)   3x - 17 = 4 -(-6)   => 3x - 17  = 10   => 3x = 27   => x = 9   Vậy x=9   b)   -15 - x = 4 + (-8)   => x = -15 - 4 + 8   => x = -11   Vậy x=-11   c)   x : (-3) = -18 + (-3)   => x : (-3) = -21   => x = -21 . (-3)   => x =63   Vậy x=63   d)   -13 + x = -48 : (-4)   => -13 + x = 12   => x= 12 + 13   => x = 25   Vậy x=25   e)   2x + 16 = -6 + 34   => 2x  = -6 + 34 - 16   => 2x =12   =>x=6   Vậy x=6