3.51X49+35.1X5.1+49X5.1
=3.51X(49+51)+49X51X0.1
=3.51X100+(50-1)X(50+1)X0.1
=351+(2500-1)X0.1
=351+2500X0.1-1X0.1
=351+250-0.1
=601-0.1
=600.9
1年前
2
求简便计算:3.51X49+35.1X5.1+49X5.1
3个回答
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