428-299zen怎样简便运算
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![428-299zen怎样简便运算](/uploads/image/z/1243701-45-1.jpg?t=428-299zen%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
428-299zen怎样简便运算
428-299zen怎样简便运算
428-299zen怎样简便运算
428-299
=428-(300-1)
=428-300+1
=128+1
=129
428 - 299 = (400 - 200) + (28 - 99) = 200 -71 = 129.
128+(300-299)=128+1=129
428-299
=428-(300-1)
=428-300+1
=128+1
=129