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\(2,4:0,125+2,4:0,25-2,4:0,5\)
\(=2,4\cdot8+2,4\cdot4-2,4\cdot2\)
\(=2,4\left(8+4-2\right)\)
\(=2,4\cdot10=24\)
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\(=\dfrac{367}{800}+\dfrac{233}{800}+\dfrac{1}{4}=1\)
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125 : 0,125 + 125 : 0,25 + 25 : 0,5
= 125 x 8+ 125x 4 + 25 x 2
=1000 + 500 + 50
= 1500 + 50
= 1550
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13, 25 : 0. 125 + 13. 25 : 0. 25 - 13. 25 : 0. 5
= 13. 25 . 8 + 13. 25 . 4 - 13, 25 . 2
= 13, 25( 8 + 4 - 2 )
= 13, 25 . 10
= 132, 5
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\(a,3,47\times\dfrac{1}{2}-2,47:2+0,5=a,3,47\times\dfrac{1}{2}-2,47\times\dfrac{1}{2}+\dfrac{1}{2}=\dfrac{1}{2}\times\left(3,47-2,47+1\right)=\dfrac{1}{2}\times2=1\)
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a)2×4,8× 0,5 +4× 16× 0,25+ 20: 10× 0,5
=(2×0,5)×4,8+(4×0,25)×16+(2×0,5)
= 4,8 + 16 +1
=21,8
b)12,5 × 3,14 ×8 +16 ×0,125 × 1,57
= 0,125×100×3,14×8+16×0,125×1,57
=(0,125×3,14×8+8×2×0,125×1,57)×100
=[0,125×3,14×8+8×0,125×(1,57×2)]×100
=[0,125×3,14×8+8×0,125×3,14]×100
= [(0,125×3,14×8)×2]×100
=6,28×100
=628
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\(\dfrac{1}{4}:0,25-\dfrac{1}{8}:0,125+\dfrac{1}{2}:0,5-\dfrac{1}{16}:0,0625\\ =0,25:0,25-0,125:0,125+0,5:0,5-0,0625:0,0625\\ =1-1+1-1\\ =0+1-1\\ =1-1\\ =0\)
38 : 0,25 + 20: 0,125 - 16 : 0,5
= 38 x 4 + 20 x 8 - 16 x 2
= 19 x 8 + 20 x 8 - 8 x 4
= 8 x (19 + 20 - 4)
= 8 x 35
= 280