85×82+82×15
=82×（85+15）
=82×100
=8200;
75×299+75
=75×(299+1)
=75×300
=22500;
125×88
=125×8×11
=1000×11
=11000;
167+89+33
=167+33+89
=200+89
=289;
5×289×2
=289×5×2
=289×10
=2890;
25×97+25×3
=25×(97+3)
=25×100
=2500;
(125+17)×8
=125×8+17×8
=1000+136
=1136;
58+39+42+61
=(58+42)+(39+61)
=100+100
=200;
(125×25)×4
=125×25×4
=125×100
=12500;
88×102
=88×(100+2)
=8800+176
=8976;
378+527+73
=378+600
=978;
76×25+25×24
=25×(76+24)
=25×100
=2500;
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