2.7×53+27×4.7=27×5.3+27×4.7=27×(5.3+4.7)=27×10=270
或者2.7×53+27×4.7=2.7×53+2.7×47=2.7×(53+47)=2.7×100=270
解释:2.7×53=2.7×5.3×10=27×5.3
27×4.7=2.7×4.7×10=2.7×47
无论变幻哪个都行
2.7×53 +27×4.7
=2.7×53+2.7×47
=2.7×(53+47)
=2.7×100
=270
请采纳
2.7×(50+3) 27×(50-3)