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98x199用巧算怎么做

原式=98×(200-1) =98×200-98×1 =19600-98 =19600-100+2 =19500+2 =19502

98x89 =(100-2)x89 =100x89-2x89 =8900-178 =8722 希望帮到你 望采纳 谢谢 加油

202×98 =202(100-2) =20200-404 =19796

运用乘法分配律 98×27 =(100-2)×27 =100×27-2×27 =2700-54 =2646

=(198-98)X98=100X98=9800

98x8 =(100-2)x8 =100x8-2x8 =800-16 =784

解:原式=64x98 =64x(100-2) =64x100-64x2 =6400-128 =6272. 答:答案是6272.

92×98=9016 此题属于“前同后补”相乘,前两位数=前数×(前数+1),后两位数=后数×后数。

0.98X2.5 =0.49X2X2.5 =0.49X5 =0.5X5-0.01X5 =2.5-0.05 =2.45

98*200=19600

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