1. Rút gọn :
a, A = |x-1|+5
b, B = 2|x+3|- 8
c, C = -3 |x-4| + 8
d, D = |x-1|+ 9 |x-2|
e, E = 2|x-2|+8|x-5|
f, F = 3|x-1|-5|x-6|
g, G = -4|x+2|-5|x+4|
h, H = -2|x-1|-4|x-8|
1. Rút gọn :
a, A = |x-1|+5
b, B = 2|x+3|- 8
c, C = -3 |x-4| + 8
d, D = |x-1|+ 9 |x-2|
e, E = 2|x-2|+8|x-5|
f, F = 3|x-1|-5|x-6|
g, G = -4|x+2|-5|x+4|
h, H = -2|x-1|-4|x-8|
Giải thích các bước giải:
$\text{a) A=|x-1|+5=x-1+5=x+4}$
$\text{b) B = 2|x+3|- 8=2(x+3)-8=2x+6-8=2x+(-2)=2(x-1)}$
$\text{c, C=(-3)|x-4| + 8=-3(x-4)+8=-3x+12+8=-3x+20}$
$\text{d, D=|x-1|+ 9|x-2|=x-1+9(x-2)=x-1+9x-18=10x-19}$
$\text{e, E=2|x-2|+8|x-5|=2(x-2)+8(x-5)=2x-4+8x-40=10x-44=2(5x-22)}$
$\text{f, F=3|x-1|-5|x-6|=3(x-1)-5(x-6)=3x-3-5x-30=-2x-33=-(2x+33)}$
$\text{g, G=(-4)|x+2|-5|x+4|=-4(x+2)-5(x+4)=-4x-8-5x+20=-9x+12=-(9x-12)}$
$\text{h, H = (-2)|x-1|-4|x-8|=-2(x-1)-4(x-8)=-2x+2-4x-32=-6x-30=6(-x-5)}$
NO COPPY;Mod xem kĩ không xóa bừa
1
a) A = |x-1|+5=x-1+5=x-4
b) B = 2|x+3|- 8=2(x+3)-8=2x+6-8=2x-2=2(x-1)
c, C = -3 |x-4| + 8=-3(x-4)+8=-3x+12+8=-3x+20=20-3x
d, D = |x-1|+ 9 |x-2|=x-1+9(x-2)=x-1+9x-18=10x-19
e, E = 2|x-2|+8|x-5|=2(x-2)+8(x-5)=2x-4+8x-40=10x-44=2(5x-22)
f, F = 3|x-1|-5|x-6|=3(x-1)-5(x-6)=3x-3-5x+30=-2x-27=-(2x+27)
g, G = -4|x+2|-5|x+4|=-4(x+2)-5(x+4)=-4x-8-5x-20=-9x-28=-(9x+28)
h, H = -2|x-1|-4|x-8|=-2(x-1)-4(x-8)=-2x-2-4x+32=-6x+30=6(-x+5)=6(5-x)