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99x78+33x66怎么巧算

99*78+33*66 =99*78+99*22 =99*(78+22) =99*100 =9900

13x2x17+13x66=13x(34+66)=1300

58x66+58+33x58 =58×(66+1+33) =58×100 =5800 你好,本题已解答,如果满意,请点右上或下角“采纳答案”,支持一下。

原式=103×251-103×2+103×51 =103×(251+51-2) =103×300 =30900

299x66+66=(299+1)X66=300X66=19800

50*(100-4)+(50+7)*4+7*(70-4) =5000-200+200+7*4+490-7*4 =5490

44x34+44x66 =44X(34+66) =44X100 =4400

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