这个题怎么做。谢谢。
2017-03-23
展开全部
1
225+478
=225+400+70+8
=625+70+8
=695+8
=703
2
390+256
=390+200+50+6
=590+50+6=640+6=646
3
567+204
=567+200+4
=767+4=771
4
143+658
=143+600+50+8
=743+50+8=793+8=801
225+478
=225+400+70+8
=625+70+8
=695+8
=703
2
390+256
=390+200+50+6
=590+50+6=640+6=646
3
567+204
=567+200+4
=767+4=771
4
143+658
=143+600+50+8
=743+50+8=793+8=801
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