下面各题,能简算的要用简便方法计算. 2.9+6.46+7.1+3.54 2.3÷8÷12.5 0.4×(25+2
下面各题,能简算的要用简便方法计算.2.9+6.46+7.1+3.542.3÷8÷12.50.4×(25+2.5)4.95×[2.46÷(5.58-5.28)]9.16-...
下面各题,能简算的要用简便方法计算. 2.9+6.46+7.1+3.54 2.3÷8÷12.5 0.4×(25+2.5) 4.95×[2.46÷(5.58-5.28)] 9.16-1.25-3.16-2.75.
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(1)2.9+6.46+7.1+3.54, =(2.9+7.1)+(6.46+3.54), =10+10, =20; (2)2.3÷8÷12.5, =2.3÷(8×12.5), =2.3÷100, =0.023; (3)0.4×(25+2.5), =0.4×25+0.4×2.5, =10+1, =11; (4)4.95×[2.46÷(5.58-5.28)], =4.95×[2.46÷0.3], =4.95×8.2, =40.59; (5)9.16-1.25-3.16-2.75, =9.16-3.16-1.25-2.75, =(9.16-3.16)-(1.25+2.75), =6-4, =2. |
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