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72层34+67乘34r怎样算最简便?????

72✘34+72✘67-72简便计算 72✘34+72✘67-72 =72*(34+67-1) =72*100 =7200

72×34 67×34-72简便算式 72×34 67×34-72 =72*(34-1)+67*34 =72*33+67*34 =2376+2278 =4654

72乘34加72乘67减72的简便运算 =72x(34+67-1) =72x100 =7200

34*34—34+34*67=34(34—1+67)=34*100=3400

67x34+67x66 =67x(34+66) =67x100 =6700

每个数位都是1加到91加到9=(1+9)*9/2=45得原算式=45*11。11=499。95

36*25*7=9*(4*25)*7=6300 68*34+68*67-68 = 68*(34+67-1)=68*100=6800

78×34+67×78-78 =78x(34+67-1) =78x100 =7800

67x67-34x34+67+34 =67x67+67-34x34+34 =67x(67+1)-34x(34-1) =67×68-34×33 =134×34-34×33 =34×(134-33) =34×101 =3434

2.68乘34.9除以34.9乘67.8除以2.68怎样列简便计算 =2.68/2.68x34.9/34.9x67.8 =1x1x67.8 =67.8

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