19·4+1·28+3·72怎么简便计算
用简便方法计算.(1)19.4-1.28-3.72(2)1.25×0.25×32(3)31.7×0.9+3.17(4)2.5×4.6+0.25×46....
用简便方法计算.
(1)19.4-1.28-3.72
(2)1.25×0.25×32
(3)31.7×0.9+3.17
(4)2.5×4.6+0.25×46. 展开
(1)19.4-1.28-3.72
(2)1.25×0.25×32
(3)31.7×0.9+3.17
(4)2.5×4.6+0.25×46. 展开
展开全部
(1)19.4-1.28-3.72,
=19.4-(1.28+3.72),
=19.4-5,
=14.4;
(2)1.25×0.25×32,
=(1.25×8)×(0.25×4),
=10×1,
=10;
(3)31.7×0.9+3.17,
=31.7×(0.9+0.1),
=31.7×1,
=31.7;
(4)2.5×4.6+0.25×46,
=2.5×4.6+2.5×4.6,
=2.5×2×4.6,
=5×4.6,
=23.
=19.4-(1.28+3.72),
=19.4-5,
=14.4;
(2)1.25×0.25×32,
=(1.25×8)×(0.25×4),
=10×1,
=10;
(3)31.7×0.9+3.17,
=31.7×(0.9+0.1),
=31.7×1,
=31.7;
(4)2.5×4.6+0.25×46,
=2.5×4.6+2.5×4.6,
=2.5×2×4.6,
=5×4.6,
=23.
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