bài 1 giải các phương trình sau:h,\(\left(\dfrac{3}{4}x-1\right)\left(\dfrac{5}{3}x+2\right)=0\)bài 2 giải các phương trình sau:b,3x-15=2x(x-5) m,(1-x)(5x+3)=(3x-7)(x-1)d,x(x+6)-7x-42=0 p,\(\left(2x-1\right)^2-4=0\)f,\(x^3+2x^2-\left(x-2\right)=0\) r,\(\left(2x-1\right)^2=49\)h,(3x-1)(6x+1)=(x+7)(3x-1) ...
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bài 1 giải các phương trình sau:
h,\(\left(\dfrac{3}{4}x-1\right)\left(\dfrac{5}{3}x+2\right)=0\)
bài 2 giải các phương trình sau:
b,3x-15=2x(x-5) m,(1-x)(5x+3)=(3x-7)(x-1)
d,x(x+6)-7x-42=0 p,\(\left(2x-1\right)^2-4=0\)
f,\(x^3+2x^2-\left(x-2\right)=0\) r,\(\left(2x-1\right)^2=49\)
h,(3x-1)(6x+1)=(x+7)(3x-1) t,\(\left(5x-3\right)^2-\left(4x-7\right)^2=0\)
j,\(\left(2x-5\right)^2-\left(x+2\right)^2=0\) u,\(x^2-10x+16=0\)
w,\(x^2-x-12=0\)
Bài `1:`
`h)(3/4x-1)(5/3x+2)=0`
`=>[(3/4x-1=0),(5/3x+2=0):}=>[(x=4/3),(x=-6/5):}`
______________
Bài `2:`
`b)3x-15=2x(x-5)`
`<=>3(x-5)-2x(x-5)=0`
`<=>(x-5)(3-2x)=0<=>[(x=5),(x=3/2):}`
`d)x(x+6)-7x-42=0`
`<=>x(x+6)-7(x+6)=0`
`<=>(x+6)(x-7)=0<=>[(x=-6),(x=7):}`
`f)x^3-2x^2-(x-2)=0`
`<=>x^2(x-2)-(x-2)=0`
`<=>(x-2)(x^2-1)=0<=>[(x=2),(x^2=1<=>x=+-2):}`
`h)(3x-1)(6x+1)=(x+7)(3x-1)`
`<=>18x^2+3x-6x-1=3x^2-x+21x-7`
`<=>15x^2-23x+6=0<=>15x^2-5x-18x+6=0`
`<=>(3x-1)(5x-1)=0<=>[(x=1/3),(x=1/5):}`
`j)(2x-5)^2-(x+2)^2=0`
`<=>(2x-5-x-2)(2x-5+x+2)=0`
`<=>(x-7)(3x-3)=0<=>[(x=7),(x=1):}`
`w)x^2-x-12=0`
`<=>x^2-4x+3x-12=0`
`<=>(x-4)(x+3)=0<=>[(x=4),(x=-3):}`
`m)(1-x)(5x+3)=(3x-7)(x-1)`
`<=>(1-x)(5x+3)+(1-x)(3x-7)=0`
`<=>(1-x)(5x+3+3x-7)=0`
`<=>(1-x)(8x-4)=0<=>[(x=1),(x=1/2):}`
`p)(2x-1)^2-4=0`
`<=>(2x-1-2)(2x-1+2)=0`
`<=>(2x-3)(2x+1)=0<=>[(x=3/2),(x=-1/2):}`
`r)(2x-1)^2=49`
`<=>(2x-1-7)(2x-1+7)=0`
`<=>(2x-8)(2x+6)=0<=>[(x=4),(x=-3):}`
`t)(5x-3)^2-(4x-7)^2=0`
`<=>(5x-3-4x+7)(5x-3+4x-7)=0`
`<=>(x+4)(9x-10)=0<=>[(x=-4),(x=10/9):}`
`u)x^2-10x+16=0`
`<=>x^2-8x-2x+16=0`
`<=>(x-2)(x-8)=0<=>[(x=2),(x=8):}`