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巧算32×37+67×37+37

巧算32×37+67×37+37 解:采用分配律, 原式=37x(32+67+1) =37x(99+1) =37X100 =3700

37+67-27+67巧算 =(37-27)x67 =10x67 =670

37+47+57+67……+207 =(37+207)×(20-3+1)÷2 =244×18÷2 =244×9 =2196

3分之2×37.5+62.5×3分之2=3分之2×37.5+62.5=3分之2×(37.5+62.5)=3分之2×1=3分之2

=75x(70-3)-37 =75x70-75x3-37 =5250-225-25-12 =5000-12 =4988

☆5957

7*10+(10+90)*9/2 拆分来看,个位都为7,一共10个,十位为10.20,,90为等差数列

67×37+38×63-37×29 =67×37-37×29+38×63 =37(67-29)+38×63 =37×38+38×63 =38(37+63) =38×100 =3800

68×37+67×63 =(67+1)×37+67×63 =67×37+67×63+37 =67×(37+63)+37 =67×100+37 =6700+37 =6737

16×37/67+37/67 =37/67×(16+1) =629/67

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