297+29.7×44.5+29.7×45.5怎么简算​ 过程一定要完整!

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297+29.7×44.5+29.7×45.5怎么简算​ 过程一定要完整!
297+29.7×44.5+29.7×45.5怎么简算​ 过程一定要完整!

297+29.7×44.5+29.7×45.5怎么简算​ 过程一定要完整!
=29.7×10+29.7×44.5+29.7×45.5
=29.7×(10+44.5+45.5)
=29.7×100
=2970

原式=297+29.7*(44.5+45.5)=297+29.7*90=297*(1+9)=2970