2.5×41用递等式计算
递等式计算,能简算的要简算.4.8×0.252.33×0.5×41.2×2.5+0.8×2.550.4×1.9-1.93.7×0.25+40.65×201....
递等式计算,能简算的要简算. 4.8×0.25 2.33×0.5×4 1.2×2.5+0.8×2.5 50.4×1.9-1.9 3.7×0.25+4 0.65×201.
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(1)4.8×0.25,
=1.2×4×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;
(2)2.33×0.5×4,
=2.33×(0.5×4),
=2.33×2,
=4.66;
(3)1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;
(4)50.4×1.9-1.9,
=(50.4-1)×1.9,
=49.4×1.9,
=93.86;
(5)3.7×0.25+4,
=0.925+4,
=4.925;
(6)0.65×201,
=0.65×(200+1),
=0.65×200+0.65×1,
=130+0.65,
=130.65.
=1.2×4×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;
(2)2.33×0.5×4,
=2.33×(0.5×4),
=2.33×2,
=4.66;
(3)1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;
(4)50.4×1.9-1.9,
=(50.4-1)×1.9,
=49.4×1.9,
=93.86;
(5)3.7×0.25+4,
=0.925+4,
=4.925;
(6)0.65×201,
=0.65×(200+1),
=0.65×200+0.65×1,
=130+0.65,
=130.65.
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