Toán Lớp 6: tìm x biết
a.5x+30=10
b.2(x+1)+18=-4
c.(x-1)(x+3)=0
d.720:[41-(2x+5)]=2^3.5
e.(5^2+3^)+(5^2+3^2)-40.x=-10^2
giúp mik mik vote 5 sao ạ uy tít
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Toán Lớp 6: tìm x biết
a.5x+30=10
b.2(x+1)+18=-4
c.(x-1)(x+3)=0
d.720:[41-(2x+5)]=2^3.5
e.(5^2+3^)+(5^2+3^2)-40.x=-10^2
giúp mik mik vote 5 sao ạ uy tít
Comments ( 1 )
tìm x biết
a.5x+30=10
5x = 10 – 30
x = -20 : 5
x = -4
b.2(x+1)+18=-4
2(x+1) = -4 – 18
x + 1 = -22
x = 22 – 1
x = 23
c.(x-1)(x+3)=0
*Th1 : * TH2:
x-1 = 0 x + 3 = 0
x = 1 x = 3
d.720:[41-(2x+5)]=2³.5
41-(2x+5)= 720 : 40
2x + 5 = 41 – 18
2x = 23 : 2
x = 11,5
e.(5²+3²)+(5²+3²)-40.x=-10²
34+34 – 40.x =100
34 – 40.x = 100 + 34
40.x = 34 – 134
x = -100 : 40
x = -2,5
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