Question

18.3除以4+5.3x2.5+71.3x0.75的简便运算方法,急

Answer 1

无污染,】

=18*0.25+5.3*0.25+71.3*3*0.25

=（18+53+71.3*3）*0.25

=（71+71*3+0.3*3）*0.25

=（71*4+0.9）*0.25

=71*4*0.25+0.9*0.25

=71+（1-0.1）*0.25

=71+0.25-0.025

=71+0.225

=71.225