9.9乘2.2加6.6乘3.7,改变其中的一个书,怎样简便计算?得数应该是46.2!!!急需!!!!

1.1×（9×2.2+6×3.7）=1.1×（19.8+22.2）=1.1×42=46.2

9.9*2.2+6.6*3.7
=3.3*(3*2.2+2*3.7)
=6.6*(3*1.1+3.7)
=6.6*(3.3+3.7)
=6.6*7
=46.2

9.9×2.2＋6.6×3.7
=(3.3×3)×2.2+6.6×3.7
=3.3×6.6+6.6×3.7
=6.6×(3.3+3.7)
=6.6×7
=46.2

大哥！本来就不用改！如果你想快速计算的话，
就把6.6=2.2*3！

9.9*2.2+6.6*3.7
=3.3*3*2.2+6.6*3.7
=6.6*(3.3+3.7)
=6.6*7
=46.2

用计算器