50道口算题

50道口算题 50道口算题卡 20+30-12= 34+25+11= 33+23+17= 41+13+23= 79+11+4= 22-18-10= 45+24+11= 21+56-15= 23+62-38= 91-45+12= 89+11-45= 48-45+21= 36+24-30= 35-(15+20)= 67-34-22= 20+30-45= 36-32+18= 21+(40-15)= 23-13+88= 4+7+89= 86+9-36= 26-17+64= 98+1-90= 69+23-49= 25+63-75= 58-41+23= 89+9-40= 33+35+37= 55+35-25= 36-25+19= 10+30+60= 24-23+49= 15+57+21= 10+78-31= 89-(56-23)= 14-(12-2)= 12+13+25= 45+25-39= 30-25-2= 97+89-36= 56+32-36= 39+35-40= 32-23+56= 17+48-37= 26+23+11= 54-45-9= 54-(45-9)= 51+15-16= 12+15+19= 33+66-88= 2+(57-13)= 16-(67-53)= 69-32-17= 86-(97-17)= 34-17-17= 34-(17+17)=