1. 26.7×5.4+2.67×46怎么简便运算
题目:
26.7×5.4+2.67×46简便计算。
解析:
这是一道小学数学简便计算题,直接计算运算量太大,观察发现,26.7=2.67×10,可以利用这层关系将两个加数化统一后再行计算。
解答:
26.7×5.4+2.67×46
=26.7×5.4+2.67×(4.6×10)
=26.7×5.4+(2.67×10)×4.6
=26.7×5.4+26.7×4.6
=26.7×(5.4+4.6)
=26.7×10
=267
方法二:
26.7×5.4+2.67×46
=(2.67×10)×5.4+2.67×46
=2.67×(10×5.4)+2.67×46
=2.67×54+2.67×46
=2.67×(54+46)
=2.67×100
=267
两种方法结果一致,说明267就是原来算式的答案,另外,本题两种方法都是可以的,运算量相当。
2. 数学,简便算法。
528-53-47 800-138-162 470-254-46
=528-(53+47) =800-(138+162) =470-(254+46)
=528-100 =800-300 =470-300
=428 =500 =170
672-36+64 545-167-145 1034+78+320+102
=672+64-36 =545-145-167 =1034+78+102+320
=736-36 =400-167 =1034+(180+320)
=700 =233 =534
325-276-24 25+75-25+75 84×63+84×37
=325-(276+24) =25-25+75+75 =84(63+37)
=325-300 =75+75 =84*100
=25 =150 =8400
127+123+184+240 8×(125+25) 487-187-139-61
=127+123+240+184 =8×125+8×25 =487-(139+61+187)
=490-184 =1000+200 =487-387
=306 =1200 =100
24×8+24×93-24 300-123-75-77 98×13
=24(8+93-1) =300-(123+77+75) =(100-2)×13
=24×100 =300-275 =1300-26
=2400 =25 =1274
只有我这么无聊的人才做你这题。