用简便方法计算.189×101-189 386-186-25-75 32000÷125÷8 125×32×25 27×187-5×187-2×187
用简便方法计算.189×101-189386-186-25-7532000÷125÷8125×32×2527×187-5×187-2×18779×99+7964×64+3...
用简便方法计算.189×101-189 386-186-25-75 32000÷125÷8 125×32×25 27×187-5×187-2×187 79×99+79 64×64+37×64-64 (100-25)÷5.
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解:(1)189×101-189 =189×(101-1) =189×100 =18900; (2)386-186-25-75 =(386-186)-(25+75) =200-100 =100; | |
(3)32000÷125÷8 =32000÷(125×8) =32000÷1000 =32; (4)125×32×25 =(125×8)×(4×25) =1000×100 =100000; | |
(5)27×187-5×187-2×187 =187×(27-5-2) =187×20 =3740; (6)79×99+79 =79×(99+1) =79×100 =7900; | |
(7)64×64+37×64-64 =64×(64+37-1) =64×100 =6400; |
=75÷5
=15.
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