①12×0.25+8.8×2.5
=1.2×2.5+8.8×2.5
=(1.2+8.8)×2.5
=10×2.5
=25
②7.5×1.01
=7.5×(1+0.01)
=7.5×1+7.5×0.01
=7.5+0.075
=7.575
祝学习快乐