用字母表示数练习
1: b c
a b c
b 5
2:
3: ⑴ 320 - x+180=500 - x
⑵ 500 - 250=250(枝)
4: ⑴ 2x+30
⑵2x+30 - x = x+30
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用字母表示数练习
1: b c
a b c
b 5
2:
3: ⑴ 320 - x+180=500 - x
⑵ 500 - 250=250(枝)
4: ⑴ 2x+30
⑵2x+30 - x = x+30
http://m.ksjqmj.com/wunianjidaan/2305.html
推荐访问