一年级下册口算题大全：两位数减整十数！ 94-20= 83-70= 63-20= 15-10= 92-70= 55-10= 42-40= 45-40= 52-20= 41-10= 79-40= 96-20= 33-20= 68-30= 64-50= 92-60= 38-10= 86-30= 94-20= 97-40=
