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简介:
用简便方法计算
0.125×2.6×0.8 46×0.77+54×0.77
=0.125×0.8×2.6 =(46+54)×0.77
=0.1×2.6 =100×0.77
=0.26 =77
5.78×101 2.5×204
=5.78×(100+1) =2.5×(200+4)
=5.78×100+5.78×1 =2.5×200+2.5×4
=578+5.78 =500+10
=583.78 =510
3.2×125 (125-40)×0.8
=0.4×(8×125) =125×0.8—40×0.8
=0.4×1000 =100-32
=400 =68