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| (1)50.4×1.9-1.9 =50.4×1.9-1.9×1 =(50.4-1)×1.9 =49.4×1.9 =93.86; (2)44.28÷0.9÷4.1 =49.2÷4.1 =12; (3)1.25×32×0.25 =(1.25×8)×(4×0.25) =10×1 =10; (4)8.6×9.9 =8.6×(10-0.1) =8.6×10-8.6×0.1 =86-0.86 =85.14; (5)18÷2.5÷0.4 =18÷(2.5×0.4) =18÷1 =18; (6)37.6×47.5-47.5×36.6 =(37.6-36.6)×47.5 =1×47.5 =47.5. |
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