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2.8398
3. 189
4. 156
=216+17-112+36
=233-112+36
=121+36
=157
2.405:15×315-107 =(405:15)×315-107
=27×315-107
=8505-107
=8398
3.51×14+1800:(-36)+(-475)= (51×14)+(1800:(-36))+(-475)
=714+(-50)+(-475)
=664+(-475)
=189
4.243-14×8+625:25=243-(14×8)+(625:25)
=243-112+25
=131+25
=156