问61.2-1.8*3-4.6 0.45*(10+0.2) 0.5*(6-0.4) 0.89*10.1 3.85*0.99 3.7*9.9 3.5*13.6-3.5*3.6的简便运
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=61.2-5.4-4.6
=61.2-(5.4+4.6)
=61.2-10
=51.2
=4.5+0.09
=4.59
=0.89*(10+0.1)
=8.9+0.089
=8.989
=3.85*(1-0.01)
=3.85-0.0385
=3.8115
=3.7*(10-0.1)
=37-0.37
=36.63
= 3.5*(13.6-3.6)
= 3.5*10
=35
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