Đáp án:
Giải thích các bước giải:
a, x(x+3)=0
th1: x=0
th2: x+3= 0
x= -3
b, th1: x-2=0 => x=2
th2: 5-x=0 <=> -x=-5
<=> x=5
c, x-1 = 0 => x = 1
x2+1= 0 vô nghiệm
d, giải luôn
<=> -12x + 60+21-7x=5<=> -19x+81= 5
<=> -19x=-76
<=> X=4
Mn giúp tớ đc ko tớ rất rất cằn gấp
Giúp mình hình 2 với mọi người
Giúp mik nha mik vote 5 sao cho
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