四年级数学.加减法简便运算
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简介
类型一：找好朋友凑整 452+35+148+65 =(452+148)+(35+65) =600+100 =700 336+17+83+64 =(336+64)+(17+83) =400+100 =500 类型二：尾数相同，优先减 712+317-512 =(712-512)+317 =200+317 =517 846-(327+146) =846-327-146 =(846-146)-327 =700-327 =373 536-(136+49) =536-136-49 =400-49 =351 类型三：尾数凑整，减去和 675-169-31 =675-(169+31) =675-200 =475 721-194-206 =721-(194+206) =721-400 =321 187-89-11 =187-(89+11) =187-100 =87 类型四：尾数相同，优先减；尾数不同，减去和 385-185-78-22 =(385-185)-(78+22) =200-100 =100 763-246-54-63 =(763-63)-(246+54) =700-300 =400
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