Question

2.21 +1.72 +2.33+ 2.14+ 1.85 +1.96怎么简算？

Answer 1

2.21+1.72+2.33+2.14+1.85+1.96

=(2.14+1.96)+(1.72+2.33+1.85)+2.21

=4.1+5.9+2.21

=12.21

追答

2.21+1.72+2.33+2.14+1.85+1.96
=(2.14+1.96)+(1.72+2.33+1.85)+2.21
=4.1+5.9+2.21
=12.21

Answer 2

=（2.21+2.14）+1.85+1.72+2.33+1.96
=（4.35+1.85）+（1.72+2.33）+1.96
=6.2+4.05+1.96
=10.25+1.96
=12.21
解法分析：凑整，利用交换律，结合律，按照四则运算法则进行运算，同级运算按顺序计算，不同级运算先算高级运算，所以就可以很快得出结果。

Answer 3

2.21 +1.72 +2.33+ 2.14+ 1.85 +1.96
=2.21+（1.72+2.33+1.85）+（2.14+1.96）
=2.21+（4.05+1.85）+4.1
=2.21+5.9+4.1
=12.21