Question

用简便方法计算:(0.75x42.6-0.574x25+57.4)/3

Answer 1

(0.75x42.6-0.574x25+57.4)/3
=(0.75x42.6-57.4x0.25+57.4x1)/3
=(0.75x42.6+57.4x1-57.4x0.25)/3
=[0.75x42.6+57.4x(1-0.25)]/3
=[0.75x42.6+57.4x0.75]/3
=0.75x(42.6+57.4)/3
=0.75x100/3
=75/3
=25

Answer 2

0.75×42.6=42.6×(1－0.25)
0.574×25=0.574×100÷4=14.35
（0.75×42.6－0.574×25＋57.4）／3
＝
（42.6－10.65－14.35＋57.4）／3
＝（100－25）／3
＝25

Answer 3

(0.75x42.6-0.574x25+57.4)/3
=(0.75x42.6-57.4x0.25+57.4)/3
=(0.75x42.6+57.4x(1-0.25))/3
=(0.75x42.6+57.4x0.75)/3
=0.75x(42.6+57.4)/3
=0.75x100/3
=25
这样做一定不会错，纯属原创，如有雷同，抄袭！！！！！！！！！

Answer 4

(0.75x42.6-0.574x25+57.4)/3 =(0.75x42.6-57.4x0.25+57.4)/3=(0.75x42.6+57.4x0.75)/3=(42.6+57.4)x0.75/3=75/3=25

Answer 5

就这样计算就可以了
(0.75x42.6-0.574x25+57.4)/3
=(0.75*42.6 - 57.4*0.25 + 57.4) /3
=(0.75*42.6 + 57.4*(1-0.25))/3
= (0.75 * 42.6 + 57.4 * 0.75)/3
= 0.75 * (42.6 + 57.4) /3
= 0.75 * 100 /3
= 0.25 * 100
= 25