北师大版二年级数学口算2627 = 94+6= 63+9 = 409+12=8470= 15+40 = 766 = 50+316=58+24= 702= 29+5 = 423 +25=516 = 26+70 = 448= 327 +48=6+40 = 63+8= 638 = 9+19+50= 624 = 34+7 = 503 = 38+76=24+9 = 408= 8+ 37 = 4620 +72=9+70 = 617 = 8070 = 16+8015=306 = 3+48 = 529 = 30+25 16=18+7 = 7440 = 802 = 72+8 40=57+6= 2814= 7536= 35+1919=
