B.
=37.46+37.54-125.8
=37(46+54)-1000
=37.100-1000
=2700
C.
a)-2
b)-7
c)12
e)4
c)-15
g)8
10 chai
⇔48+3x=-46+458
⇔48+3x=412
⇔3x=364
⇔x=364/3