3.45*2.8+3.45*8.2-345的简便计算（17.4*0.15+0.15*2.6）*3的简便计算_数学解答

3.45*2.8+3.45*8.2-345的简便计算（17.4*0.15+0.15*2.6）*3的简便计算

人气：293 ℃　时间：2020-04-13 20:42:08

解答

3.45*2.8+3.45*8.2-34.5
=3.45*(2.8+8.2-10)
=3.45*1
=3.45
（17.4*0.15+0.15*2.6）*3
=0.15*(17.4+2.6）*3
=0.15*20*3
=9