câu 1
a (-17)+23+77+17
b 60+45+(-15)+(-45)
c (-3)+(-185)+(-17)+185
d (-3)+(-4)+66+(-13)
e (231-39)-231
g (-212)-(57-212)
h 721-(721-12)
J (-812-45)-(55-812)
k (-53-23)-(567-53)
l (-77-23)-(567-77)
câu 2
a (135+x)-135=0
b (-562)-(x-562)=0
c (25+x)-25=0
d (-19)-(x-19)=0
e 61+(x-23)=91
g11-(-53+x)=97
h 15+(x-10)=23
j 19-(-13+x)=40
k|x+7|(-8)=-25+73
l |2x-5|-2|5-2x|=-3
câu 3
a-(a-b)+(b-c)-(a-c)=2b-2a
b-(-a+b+c)+(b+c-1)=-(b-a)-(1-b)
c-(-a+b-c)+(b-c+6)=a+6
Loga
Sinh Học lớp 12
