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99*999+199简便方法计算

99×999+199 =99×999+99+100 =99×(999+1)+100 =99×1000

99x999+199 =99x(1000-1)+199 =99x1000-99+199 =99

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解:99×999+199 =99×(1000-1)+199 =99000-99+199

99x99+199 =99x99+100+99 =99x(99+1)+100 =99x100+100

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

解:1999+199.9+19.99+1.999+2.111 = 1999+199.9+19.99+

格V出差刚吃过吃药

99×999+199 =99×999+99+100 =99×(999+1)+100 =99×1000

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