50 以内不进位混合加减法30+10= 21+20= 23+22=26+10= 21+24= 23+15=15+30= 31+16= 41+5=37+11= 11+13= 23+10=32+22= 22+14= 25+13=33+10= 24+12= 21+10=14+30= 22+17= 14+30=14+31= 15+22= 16+21=17+12= 21+12= 23+11=17+30= 23+13= 15+20=12+31= 21+22= 34+11=28+21= 34+14= 35+12=33+10= 24+12= 21+10=17+30= 23+13= 15+20=45-11= 36-12= 33-11=21-10= 25-14= 48-15=34-21= 47-17= 49-32=32-21= 50-10= 29-17=45-15= 49-22= 37-22=38-11= 37-16= 33-11=36-21= 44-14= 28-17=45-11= 49-22= 29-17=36-21= 36-12= 33-11=38-11= 36-12= 50-10=25-14= 49-22= 33-11=47-31= 27-12= 37-27=55-34= 48-17= 49-31=35-24= 44-34= 27-13=46-34= 38-17= 42-11=
