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题目:在○里填上“>”“<”或“=”。(1)45+30○54+30(2)34+60○34+5(3)63-40○78-40【分析(4与)8解7-】5○87-50(5)90-60○90-25这道题不必计算,只要观察数字就可以比较出大小。比较的方法是:两个加法算式比较大小:其中一个加数相同时,就只需比较另一个加数的大○小——另一个加数大的算式和就大。第(1)题:45+3054+30,相同加数是30,只需比较和54的大小。45455445+3054+30
Title: Type in “” “” < “or” = "in ○. (1) 45 + 30 ○ 54 + 30 (2) 34 + 60 ○ 34 + 5 (3) 63-40 ○ 78-40 【Analysis (4 and) 8 Solution 7-】 5 ○ 87-50 (5) 90 -60 ○ 90-25 This question does not have to be calculated, as long as the figures can be compared to see the size. The method of comparison is: two addition formula comparison size: one of the same when the number of additions, you only need to compare another plus large ○ small - another large sum of the formula and big. Question (1): 45 + 3054 + 30, the same plus is 30, just compare with the size of 54. 45455445 + 3054 + 30