原式=4.25×10×3.7+4.25×63 =4.25×(37+63)=4.25×100=425注:注意观察式子4.25和42.5差个10倍,可以先把42.5化成4.25×10,就可以提公因数了。
42.5×3.7 +4.25×63=4.25×37 +4.25×63=4.25×(37 +63)=4.25×100=425
42.5×3.7 +4.25×63=42.5×3.7 +42.5×6.3=42.5×(3.7 +6.3)=42.5×10=425