两位数加整十数一位数口算题
15+30=39+50=78+20=44+20=27+50=60+11=40+51=50+36=15+70=56+40=30+63=87+10=22+6=63+5=43+3=25+3=12+7=35+
1530 += 354 += 135 += 3950 += 1410 += 154 += 7820 += 4420 += 172 += 4420 += 530 += 671 += 2750 += 1066 += 441 += 6011 += 2017 += 811 += 4051 += 1640 += 642 += 5036 += 3033 += 262 += 1570 += 1910 += 605 += 5640 += 230 += 452 += 3063 += 2053 += 7420 += 8710 += 4040 += 2032 += 226 += 1066 += 2020 += 635 += 3020 += 4010 += 433 += 4510 += 3310 += 253 += 554 += 5037 += 127 += 372 += 7820 +=

