用自己喜欢的方法计算2.5×（0.89×0.4）111.9×3.46-3.46×11.913.9-6.18-2.82．13.46+6.89+6.54+0.113.76×0.25+25.823×2.5-7.5．

Question

用自己喜欢的方法计算

2.5×（0.89×0.4）	111.9×3.46-3.46×11.9	13.9-6.18-2.82．
13.46+6.89+6.54+0.11	3.76×0.25+25.8	23×2.5-7.5．

Answer 1

（1）2.5×（0.89×0.4）
=（2.5×0.4）×0.89
=1×0.89
=0.89

（2）111.9×3.46-3.46×11.9
=（111.9-11.9）×3.46
=100×3.46
=346

（3）13.9-6.18-2.82
=13.9-（6.18+2.82）
=13.9-9
=4.9

（4）13.46+6.89+6.54+0.11      
=（13.46+6.54）+（6.89+0.11）
=20+7
=27      

（5）3.76×0.25+25.8
=0.94+25.8
=26.74

（6）23×2.5-7.5
=57.5-7.5
=50