用合理灵活的方法计算.
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| (1)30.9÷[14-(9.85+1.15)] =30.9÷[14-11] =30.9÷3 =10.3; (2)1.2×7.26+1.2×2.74 =1.2×(7.26+2.74) =1.2×10 =12; (3)0.25×32×12.5 =(0.25×4)×(8×12.5) =1×100 =100; (4)21.14+9.2×1.3 =21.14+11.96 =33.1; (5)7.8÷0.15÷4 =52÷4 =13; (6)7.1×101 =7.1×(100+1) =7.1×100+7.1 =710+7.1 =717.1. |
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