题干
口算
300–150 =____ 300+105 =____ 80+120=____
315–200=____ 800–600 =____ 205+50 =____
5×2+24 =____ 16÷4+20 =____ 35 + 15-40 =____
答案(点此获取答案解析）
150,405,200,115,200,255,34,24,10
