照样子口算。
33+( )=89
72+( )=90
230+( )=670
26+( )=87
53+( )=80
33+( )=79
32+( )=90
522+( )=969
16+( )=81
86+( )=96
453+( )=715
38+( )=78
( )+16=47
( )+23=64
( )+510=860
( )+13=59
( )+45=74
( )+527=721
( )+27=39
( )+62=89
( )+202=395
( )+23=53
( )+38=401
( )+29=87
33+( )=89
72+( )=90
230+( )=670
26+( )=87
53+( )=80
33+( )=79
32+( )=90
522+( )=969
16+( )=81
86+( )=96
453+( )=715
38+( )=78
( )+16=47
( )+23=64
( )+510=860
( )+13=59
( )+45=74
( )+527=721
( )+27=39
( )+62=89
( )+202=395
( )+23=53
( )+38=401
( )+29=87
答案:
56,18,440,61,27,46,58,447,65,10,262,40,31,41,350,46,29,194,12,27,193,30,363,58
解析:根据加法各部分间的关系,一个加数=和-另一个加数。
33+( )=89,89-33=56;
72+( )=90,90-72=18;
230+( )=670,670-230=440;
26+( )=87,87-26=61;
53+( )=80,80-53=27;
33+( )=79,79-33=46;
32+( )=90,90-32=58;
522+( )=969,969-522=447;
16+( )=81,81-16=65;
86+( )=96,96-86=10;
453+( )=715,715-453=262;
38+( )=78,78-38=40;
( )+16=47,47-16=31;
( )+23=64,64-23=41;
( )+510=860,860-510=350;
( )+13=59,59-13=46;
( )+45=74,74-45=29;
( )+527=721,721-527=194;
( )+27=39,39-27=12;
( )+62=89,89-62=27;
( )+202=395,395-202=193;
( )+23=53,53-23=30;
( )+38=401,401-38=363;
( )+29=87,87-29=58。
解析:根据加法各部分间的关系,一个加数=和-另一个加数。
33+( )=89,89-33=56;
72+( )=90,90-72=18;
230+( )=670,670-230=440;
26+( )=87,87-26=61;
53+( )=80,80-53=27;
33+( )=79,79-33=46;
32+( )=90,90-32=58;
522+( )=969,969-522=447;
16+( )=81,81-16=65;
86+( )=96,96-86=10;
453+( )=715,715-453=262;
38+( )=78,78-38=40;
( )+16=47,47-16=31;
( )+23=64,64-23=41;
( )+510=860,860-510=350;
( )+13=59,59-13=46;
( )+45=74,74-45=29;
( )+527=721,721-527=194;
( )+27=39,39-27=12;
( )+62=89,89-62=27;
( )+202=395,395-202=193;
( )+23=53,53-23=30;
( )+38=401,401-38=363;
( )+29=87,87-29=58。
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