a=4×100÷10÷10+2×213-366÷3
b=405÷5+8×10-9×8
c=10×100-87×5×2+500÷5
_______________________
a+b+c=?
a=4×100÷10÷10+2×213-366÷3
=400÷10÷10+426-122
=40÷10+426-122
=4+426-122
=430-122
=308
b=405÷5+8×10-9×8
=81+80-72
=161-72
=89
c=10×100-87×5×2+500÷5
=1000-435×2+100
=1000-870+100
=130+100
=230
a+b+c=308+89+230
=397+230
=627