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 ...
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.
=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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