计算下面各题,能用简便方法的就用简便方法计算.(1)15.52-1.6×5-5.7 (2)9.83×1.5+6.17×1.5(3)1
计算下面各题,能用简便方法的就用简便方法计算.(1)15.52-1.6×5-5.7(2)9.83×1.5+6.17×1.5(3)19.8-0.6×0.6-0.64(4)0...
计算下面各题,能用简便方法的就用简便方法计算.(1)15.52-1.6×5-5.7 (2)9.83×1.5+6.17×1.5(3)19.8-0.6×0.6-0.64(4)0.125×7.9×8(5)63×10.1 (6)21.5÷[(6.07+2.53)×0.5].
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(1)15.52-1.6×5-5.7, =15.52-8-5.7, =7.52-5.7, =1.82; (2)9.83×1.5+6.17×1.5, =1.5×(9.83+6.17), =1.5×16, =1.5×2×8, =24; (3)19.8-0.6×0.6-0.64, =19.8-0.36-0.64, =19.8-(0.36+0.64), =19.8-1, =18.8; (4)0.125×7.9×8, =0.125×8×7.9, =1×7.9, =7.9; (5)63×10.1, =63×(10+0.1), =63×10+63×0.1, =630+6.3, =636.3; (6)21.5÷[(6.07+2.53)×0.5], =21.5÷[8.6×0.5], =21.5÷[0.5×2×4.3] =21.5÷4.3, =5. |
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