Question

用简便方法9.9*0.5+3.3*1.2+1.1*1.9

用简便方法9.9*0.5+3.3*1.2+1.1*1.9

Answer 1

原式
=1.1x9x0.5+1.1x3x1.2+1.1x1.9
=1.1x4.5+1.1x3.6+1.1x1.9
=1.1x(4.5+3.6+1.9)
=1.1x(8.1+1.9)
=1.1x10
=11

供参考。