简便计算 (18 19:5:39)(1+0.12+0.23)X(0.12+0.23+0.34)-(1+0.12+0.23+0.34_数学解答

简便计算 (18 19:5:39)
(1+0.12+0.23)X(0.12+0.23+0.34)-(1+0.12+0.23+0.34)X(0.12+0.23)
如果A▲B=3A-2B ,求2▲( 3▲4 )

人气：193 ℃　时间：2020-01-05 04:44:17

解答

1.原式=1*（0.12+0.23+0.34）+（0.12+0.23+0.34）*（0.12+0.23）-[1*(0.12+0.23)+(0.12+0.23)*(0.12+0.23+0.34)]= （0.12+0.23+0.34）+（0.12+0.23+0.34）*（0.12+0.23）-(0.12+0.23)-(0.12+0.23)*(0.12+0.23+0.34)=...