大家看一看这6道简便计算怎么做，请把算或发过来。
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54.9*0.38
=5.49*(4-0.2)
=21.96-1.098
=20.9502
4.05+37.85
=41.9
1.25*0.7*0.8
=1.25*0.8*0.7
=0.7
9.8*25
=980/4
=245
6.1*3.6+3.6*3.9
=3.6*(6.1+3.9)
=36
2.96*40
=(30-0.4)*4
=120-1.6
=118.4
=5.49*(4-0.2)
=21.96-1.098
=20.9502
4.05+37.85
=41.9
1.25*0.7*0.8
=1.25*0.8*0.7
=0.7
9.8*25
=980/4
=245
6.1*3.6+3.6*3.9
=3.6*(6.1+3.9)
=36
2.96*40
=(30-0.4)*4
=120-1.6
=118.4
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