首先观察每个式子里其实都有1.25,12.5是1.25×10,125是1.25×100。所以原来的式子就变为725×1.25+44.5×1.25+3.5×1.25=1.25×(725+44.5+3.5)=1.25×773=966.25
原式=7.52×125+0.445×125+0.035×125
=(7.52+0.445+0.035)×125
=(7.52+0.48)×125
=8×125
=1000
752✘1.25+4.45✘12.5+0.035✘125
=12.5x(752x0.1+4.45+0.035x10)
= 12.5x(75.2+4.45+0.35)
=12.5x(75.2+4.8)
=12.5x80
=1000
7.52×125+0.445×125+0.035×125
=125×(7.52+0.445+0.035)
=125×8
=1000