简算:0.25×4.78×40.65×2011.2×2.5+0.8×2.54.8×0.256.53÷0.4÷2.51.8×20.1.
除法
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简算:
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(1)0.25×4.78×4,
=(0.25×4)×4.78,
=1×4.78,
=4.78;(2)0.65×201,
=0.65×(200+1),
=0.65×100+0.65×1,
=130+0.65,
=130.65;(3)1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;(4)4.8×0.25,
=1.2×4×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;(5)6.53÷0.4÷2.5,
=6.53÷(0.4×2.5),
=6.53÷1,
=6.53;(6)1.8×20.1,
=1.8×(20+0.1),
=1.8×20+1.8×0.1,
=36+0.18,
=36.18.
