3.6×1.1-0.76
=3.6×1.1-0.36-0.4
=3.6×(1.1-0.1)-0.4
=3.6-0.4
=3.2
3.5×1.1-0.35
=3.5×1.1-3.5×0.1
=3.5×(1.1-0.1)
=3.5