1、2648456 640604 567366 500(400396)=7295 564+264453 750-(546+30)659-450 =980+980 6700+728 14+95 900(71-68)=18-426 12645 8(910-720)760-540+110 =650+125-350 803+560 945-320-420 240625 =80 7180 1602230 400 8+350 320864 =270 3+15 63 9+320 280+32 6 3069=(690-240)5 (729)+(568)54 9 8 25 4 5=3608+150 60(23-17
2、)224221 213410=402174 140728 94420 2804=12052 202369 305240 81987=665+77 921+74 8062 7707+65=807202 100505 35357 302302=60083 401005 434255 60123 =648456=640604 5720 42736 =37419 104204 153105 255426=35587 729366 214549 72895 =364212 255164 567366 500(400396)=7295 564+26-453 765-(546+45)654-50=98+98
3、0 900-(450+25)67+728 146+9 =900(71-68)1809-6 1263 8(91-72)=76-54+111 650+125-350 83+560 945-320-420 =240625 80 7180 160223 400 8+35=320864 270 3 9 63 9+32 280+32 6=5 30069 (690-240)5 (729)+(568)54 9 8 =280 4 5 608+157 60(23-17)96049=35059 4505+120 (690-240)5 755205 =250 5+60 (100+320)70 (230-130)3 802-40 =4(60-25)(300+150)2 (260-200)5 606+25 =4515493 36+48-25 (34-27)5 96-68 =29+427 43+26-17 4885 37-279 =(26-19)6 64(24-16)36+48-25 96-68=