Toán Lớp 6: HELP ME PLEASEE Bài 1 : a. 2.(-x+2 )+( -4)=(-14) b. 240 : (x-4) = 17+(-9) c. 2.(x+3)^3-200 = 2.5^2

Question

Toán Lớp 6:  HELP ME PLEASEE Bài 1 : a. 2.(-x+2 )+( -4)=(-14) b. 240 : (x-4) = 17+(-9)  c. 2.(x+3)^3-200 = 2.5^2

truonganhthi · Answer

1.   a, 2(-x + 2) + (-4) = -14   => 2(-x + 2) = -14 - (-4)   => 2(-x + 2) = -10   => -x + 2 = -10 : 2   => -x + 2 = -5   => -x = -5 - 2   => -x = -7   => x = 7   Vậy x = 7   b, 240 : (x - 4) = 17 + (-9)   => 240 : (x - 4) = 8   => x - 4 = 240 : 8   => x - 4 = 30   => x = 34   Vậy x = 34   c, 2(x + 3)^3 - 200 = 2. 5^2   => 2(x + 3)^3 - 200 = 2. 25   => 2(x + 3)^3 - 200 = 50   => 2(x + 3)^3 = 50 + 200   => 2(x + 3)^3 = 250   => (x + 3)^3 = 125   => (x + 3)^3 = 5^3   => x + 3 = 5   => x = 5-3 = 2   Vậy x = 2

tonhu12 · Answer

a,       2.(-x+2)+(-4)=(-14)       2.(-x)+4-4=-14       2.(-x)=-14       -x=-14:2       -x=-7       x=7       b,       240:(x-4)=17+(-9)       240:(x-4)=8       x-4=240:8       x-4=30       x=34       c,       2.(x+3)^3-200=2.5^2       2.(x+3)^3-200=50       2.(x+3)^3=250       (x+3)^3=250:2       (x+3)^3=125       (x+3)^3=5^3       x+3=5       x=2