1、二年级数学100以内的加减混合运算18+20+28= 22+(30-22)= 21-8+39=66-10+19= 38+20+19= 29+20+26=)37-(10+16)= 45+(30-22)= 60-40+26= 29+30+26= 67-(50+16)= 45+10-22= ,75-60-26= 99-60+45= 24+(47-20)= 88-30+49= 28+10+17= 56+(40-26)= 67+20-45= 51-40+39= 73-(37+20)=22+20+21= 81-30-18= 21+(19-10)= ?15+55-33= 89-39-20= 12+10+37
2、= 34-(8 +12)= 12+13+15= 47-(17+10)= 38-10+51= 29+20+27= 51-(16+26)= 28+(20-27)= 89-30-28= 27-(38-17)= 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= 21-15+40= 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= 12+15+19= 69-32-17=