100以内加减法填括号（2023-07-21）

100以内加减法填括号（2023-07-21）：31+( )=99 43+( )=95 ( )-18=12 91-( )=55 85-( )=31 90-( )=4 ( )+40=85 ( )+17=90 ( )+12=70 ( )-79=10 ( )+22=61 ( )+16=56 ( )-7=30 ( )+38=100 56+( )=77 ( )-49=28 18+( )=64 74+( )=97 ( )+33=53 83+( )=91 ( )+25=89 ( )-19=10 ( )-37=54 ( )+10=86 27-( )=21 13+( )=35 ( )-57=37 15+( )=24 24+( )=89 38+( )=68 ( )-10=1 ( )-38=61 ( )-18=78 84-( )=41 ( )-26=13 25+( )=83 ( )+26=56 27+( )=72 ( ...