3.09×6.1＋0.61×69.1简便计算
3.09×6.1+0.61×69.1=30.9×0.61+0.61×69.1=0.61×(30.9+69.1)=0.61×100=61
或：3.09×6.1+0.61×69.1=3.09×6.1+6.1×6.91=6.1×(3.09+6.91)=6.1×10=61
原式=6.1×10=61。
3.09x6.1+0.61x69.1
=30.9x0.61+0.61x69.1
=0.61x(30.9+69.1)
=0.61x100
=61。
3.09×6.1＋0.61×69.1
=30.9*0.61+0.61*69.1
=100*0.61=61
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