下面各题,能简算的要用简便方法计算.2.9+0.46+7.1+0.5430÷2.5+1.6×2.50.4×(25+2.5)4.97×[2.46÷(5.58-5.28)].
(1)2.9+0.46+7.1+0.54, =(2.9+7.1)+(0.46+0.56), =10+1, =11; (2)30÷2.5+1.6×2.5, =12+4, =16; (3)0.4×(25+2.5), =25×0.4+2.5×0.4, =10+1, =11; (4)4.97×[2.46÷(5.58-5.28)], =4.97×[2.46÷0.3], =4.97×8.2, =40.754. |
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