Bài 1:
\(a,4x-10=0\\ \Leftrightarrow4x=10\\ \Leftrightarrow x=\dfrac{5}{2}\\ b,7-3x=9-x\\ \Leftrightarrow x-3x=9-7\\ \Leftrightarrow-2x=2\\ \Leftrightarrow x=-1\\ c,2x-\left(3-5x\right)=4\left(x+3\right)\\ \Leftrightarrow2x-3+5x=4x+12\\ \Leftrightarrow2x+5x-4x=3+12\\ \Leftrightarrow3x=15\\ \Leftrightarrow x=5\\ d,5-\left(6-x\right)=4\left(3-2x\right)\\ \Leftrightarrow5-6+x=13-8x\\ \Leftrightarrow x+8x=13-5+6\\ \Leftrightarrow9x=14\\ \Leftrightarrow x=\dfrac{14}{9}\)
\(e,4\left(x+3\right)=-7+17\\ 4x+12=-7+17\\ 4x=-2\\ x=-\dfrac{1}{2}\\ f,5\left(x-3\right)-4=2\left(x-1\right)+7\\ 5x-15-4=2x-2\\ 5x-2x=15+4-2\\ 3x=17\\ x=\dfrac{17}{3}\)
bài 1
a)4x-10=0
⇔4x=10
⇔x=\(\dfrac{5}{2}\)
b)7-3x=9-x
⇔-3x+x=9-7
⇔-2x=2
⇔x=-1
c)2x-(3-5x)=4(x+3)
⇔2x-3+5x=4x+12
⇔2x+5x-4x=12+3
⇔3x=15
⇔x=5
d)5-(6-x)=4(3-2x)
⇔5-6+x=12-8x
⇔x+8x=12-5+6
⇔9x=13
⇔\(x=\dfrac{13}{9}\)
e)4(x+3)=-7x+17
⇔4x+12=-7x+17
⇔4x+7x=17-12
⇔11x=5
⇔x=\(\dfrac{5}{11}\)
f)5(x-3)-4=2(x-1)+7
⇔5x-15-4=2x-2+7
⇔5x-2x=-2+7+15+4
⇔3x=24
⇔x=8
bài 2
a)(5x-4)(4x+6)=0
⇔5x-4=0 hoặc 4x+6=0
⇔x=\(\dfrac{4}{5}\)hoặc x=\(-\dfrac{3}{2}\)
b)(3,5x-7)(2,1x-6,3)=0
⇔3,5x-7=0 hoặc 2,1x-6,3=0
⇔x=2 hoặc x=3
c)(4x-10)(24+5x)=0
⇔4x-10=0 hoặc 24 +5x=0
⇔x=\(\dfrac{5}{2}\) hoặc x=\(-\dfrac{24}{5}\)
d)(x-3)(2x+1)=0
⇔x-3=0 hoặc 2x+1=0
⇔x=3 hoặc x=\(-\dfrac{1}{2}\)
e)(5x-10)(8-2x)=0
⇔5x-10=0 hoặc 8-2x=0
⇔x=2 hoặc x=4
f)(9-3x)(15+3x)=0
⇔9-3x=0 hoặc 15+3x=0
⇔x=3 hoặc x=-5
