用递等式计算(能简算的要简算)
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| (1)20.9+10.2÷(5.2-3.5) =20.9+10.2÷1.7 =20.9+6 =26.9 (2)9.4×[1.28-(1.54-0.31)] =9.4×[1.28-1.23] =9.4×0.05 =0.47 (3)10.64+7.65×2.4+11.76 =10.64+18.36+11.76 =(10.64+18.36)+11.76 =29+11.76 =40.76 (4)15.52-4.3-5.7 =15.52-(4.3+5.7) =15.52-10 =5.52 (5)9.83×(3.8-2.3)+1.5×6.17 =9.83×1.5+9.255 =14.745+9.255 =24 (6)[(6.1-4.6)÷0.8-1]×0.4 =[1.5÷0.8-1]×0.4 =[1.875-1]×0.4 =0.875×0.4 =0.35 |
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