作业帮20.5*3.45+(3.67-2.39)简便计算
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/06 10:53:57
20.5*3.45+(3.67-2.39)简便计算
20.5*3.45+(3.67-2.39)简便计算
20.5*3.45+(3.67-2.39)简便计算
20.5*3.45+(3.67-2.39)
=(20+0.5)*3.45+1.28
=20*3.45+3.45/2+1.28
=69+1.725+1.28
=72.005
3.45×102 =3.45×(100+2) =3.45×100+3.45×2 =345+6.9 =351.9 0.47×0.5×0.8 =0.47×(0.5×0.8) =0.47×0.4 =0.188 0
72.005
20.5*3.45+(3.67-2.39)简便计算
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