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99×999+199简便的脱式计算

简便的脱式计算 99×999+199 =99x(1000-1)+(200-1)x1 =(

不知道,,

199×7加199×2加199用脱式计算 =199×(7+2+1) =199×10 =1990

89×199+89 =89×(199+1) =89×200 =17800

99x999+199 =99x999+99+100 =99x(999+1)+100 =99x1000

74×199 =74×(200-1) =74×200-74×1 =14800-74 =147

199×74=(200-1)×74=200×74-74 =14800-74=14726

58×199+58 =58×(199+1) =58×200 =11600

89×199+85 =89×199+89-4 =89×(199+1)-4 =89×200-4

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