递等式计算,能巧算的要验算(中间竖式请列在题目傍边空白处,合理使用空间不要遮盖其他题目数字)先思考
递等式计算,能巧算的要验算(中间竖式请列在题目傍边空白处,合理使用空间不要遮盖其他题目数字)先思考是否可以巧算1358+(442-378)-62225×58+25+25×...
递等式计算,能巧算的要验算(中间竖式请列在题目傍边空白处,合理使用空间不要遮盖其他题目数字)先思考是否可以巧算 1358+(442-378)-622 25×58+25+25×41 62×33+2632÷56 101×15+358 104×45÷52 25×(40×6) 532×76÷38 125×8÷125×8 28×25+375÷25 4260÷60×104 796×3+584 207×16+218×64.
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(1)1358+(442-378)-622, =1358+64-622, =1422-622, =800; (2)25×58+25+25×41, =25×(58+1+41), =25×100, =2500; (3)62×33+2632÷56, =2046+47, =2093; (4)101×15+358, =(100+1)×15+358, =100×15+15+358, =1500+15+358, =1515+358, =1873; (5)104×45÷52, =104÷52×45, =2×45, =90; (6)25×(40×6), =25×40×6, =1000×6, =6000; (7)532×76÷38, =532×(76÷38), =532×2, =1064; (8)125×8÷125×8, =125÷125×8×8, =1×8×8, =64; (9)28×25+375÷25, =700+15, =715; (10)4260÷60×104, =71×104, =71×(100+4), =71×100+71×4, =7100+284, =7384; (11)796×3+584, =2388+584, =2972; (12)207×16+218×64, =3312+13952, =17264. |
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