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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

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

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

12.34+23.45+34.56+45.67+56.78+67.879+78.91+89.12+91.23 =10*(1+2+3+..+9)+(2+3+4+..+9+1)+(0.3+0.4+...+0.9+0.2+0.1)+(0.04+0.05+0.06+...+0.01+0.02+0.03) =10*45+45+4.5+0.45 =450+45++4.5+0.45 =499.95 [注释:1+2+3+4+..+9=(1+9)*10/2=45...

72乘34加72乘67减72简便运算 72乘34加72乘67减72 =72*(34+67-1) =72*100 =7200

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

34×34-34+34×67 =34×(34-1+67) =34x100 =3400

416*67-416+34*416 =416×(67-1+34) =416×100 =41600

358X67-328+34X358 =358X(67-1+34) =358x100 =35800.

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

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