金星教育小学网这个问题是7.8*5.6+2。3*4.4如何简单计算？
=7.8X5.6+2.3X(10-5.6)
=7.8X5.6+23-2.3X5.6
=(7.8-2.3)X5.6+23
=5.5X5.6+23
=(5+0.5)X(5+0.6)+23
=25+2.5+3+0.3+23
=53.8
=7.8X5.6+23-2.3X5.6
=(7.8-2.3)X5.6+23
=5.5X5.6+23
=(5+0.5)X(5+0.6)+23
=25+2.5+3+0.3+23
=53.8