四上数学《运算律》专项突破攻略：脱式计算
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简介
四上数学《运算律》专项突破攻略：脱式计算 1. 下面各题怎样算简便就怎样算。 687-(187+56) =687-187-56 =500-56 =444 125×88+12×125 =125×(88+12) =125×100 =12500 395-128-195-72 =267-195-72 =72-72 =0 (103×12-650) ÷2 =(1236-650)÷2 =586÷2 =293 286×11-86×11 =(286-86)×11 =200×11 =2200 359+165+41-65 =(359+41)+(165-65) =400+100 =500 18×34+16×18 =18×(34+16) =18×50 =900 46×25×4 =46×(25×4) =46×100 =4600 768÷[16×(102-98)] =768÷[16×4] =768÷64 =12 125×(28×8) =125×8×28 =1000×28 =28000 19×76+25×19-19 =19×(76+25-1) =19×100 =1900 1563-728-272 =1563-(728+272) =1563-1000 =563 [248-(35+46)]×12 =[248-81]×12 =167×12 =2004 39×74+26×39 =39×(74+26) =39×100 =3900 504÷[104-(456-376)] =504÷(104-80) =504÷24 =21
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