GIẢI CÁC PHƯƠNG TRÌNH SAU
a , 3 - (3x + 1 )+ 2 / 2 = 2 ( 5x + 1 ) / 3
b , 3x / 5 + x-1 /4 = 5 - 3x-1/2
c, 2x-1/2 +5-x/6 =2- 3(x+1)/4
1 câu trả lời
a. 3-(3x+1)+2/2=2(5x+1)/3
= 3-3x-1+2/2= 2(5x+1)/3
= 3-3x-1+1= 2(5x+1)/3
= 3-3x=2(5x+1)/3
= -3x3 =2(5x+1)/3
= -3x3 =10x+2/3
= x=7/19
Vậy S= (7/19)
B. 3x / 5 + x-1 /4 = 5 - 3x-1/2
= 12x+5(x-1)/20=20-10(3x-1)/2
= 12x+5(x-1)=20-10(3x-1)
=12x+5x-5=20-30x+10
= 12x+5+30x=20+10+5
= 47x=35
x=35/47
Vậy S=(35/47)
c.2x-1/2 +5-x/6 =2- 3(x+1)4
= 6(2x-1)+2(5x-6)/12= 12-9(x+1)/12
= 6(2x-1)+2(5x-6)= 12-9(x+1)
= 12x-6+10x-12=12-9x-9
= 12x+10x+9x=12-9+6+12
= 31x=30
= x=30/31
Vậy S=(30/31)
