米长
米的是 = |  = |  = |  = |
 = |  = |  = |  = |
 = |  = |  = |  = |
 + = |  + = | 2﹣ = |  + + = |  ﹣= |
 ﹣ = |  + = | 1 += |  ﹣ = | 1﹣ ﹣= |
时，不能直接相加，是因为他们的分母不同，也就是
，减去（ ）次得0．| A．7 | B．8 | C．10 |
=
⑵
+x=
⑶x+
﹣
=1 ⑷
﹣x=
+
kg多
kg是
m比
m． 
，照这样计算，剩下的工作还需要
，第二天修了
，还剩全长的（ ）．| A． | B． | C． |
 + = |  ﹣ = |  + = |  + = |
1﹣ = |  ﹣ = |  + = |  ﹣ = |
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