3.51*49+35.1*5.1+49*51简便

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/05 09:47:10
3.51*49+35.1*5.1+49*51简便

3.51*49+35.1*5.1+49*51简便
3.51*49+35.1*5.1+49*51简便

3.51*49+35.1*5.1+49*51简便
3.51*49+35.1*5.1+49*51
=3.51(49+51)+49*51
=351+49*51
=351+(50-1)*51
=351+50*51-51
=351+2550-51
=2850
打字不易,

3.51×49+35.1×5.1+49×51
=3.51(49+51)+49×51
=351+(50-1)(50+1)
=351+50²-1
=350+2500
=2850

原式=(3.51*50-3.51)+(35.1*5+3.51)+(49*50+49)=3.51*50+35.1*5+49*50+49=175.5+175.5+2450+49=2850