Tính hợp lý:
a,457+(123-457)-4
b,2019(513+1759)-(-513)
c,35-107+207-35+(-207)
d,307+(-17)-307+77
e,-(-2019)+(-2019)-4001+102
f,|-85|-(-15).3
g,101.107+101.18-25.101
h,15-(-85)+513-(-500+513)
k,(-118)+(-31)+98+|-118|+(-69)
l,117.(15-116)+116.(117-20)
m,125.(-176)+125.76+100.125
n,719.89-719.(-11)-100.719
o,1513.177-1513.77+100.(-77)
p,-69.|-415|-31.|415|
q,(-219).(85-417)-85.(417-219)
r,(-167).(617-34)-617.(34-167)
Loga
Sinh Học lớp 12
