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19,4 + 3 x 19,4 + 19,4 : 0,5 + 19,4 : 0,25
= 19,4 x 1 + 3 x 19,4 + 19,4 x 2 + 19,4 x 4
= 19,4 x ( 1 + 3 + 2 + 4)
= 19,4 x 10
= 194
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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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1/2 : 0,5 + 1/4:0.25 + 1/8 : 0,125=1/2x2 + 1/4x4 + 1/8x8=1+1+1=3
tk mik nha!!chúc bạn học giỏi
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a) 128,5 : 0,5 + 128,5 x 3 + 128,5 : 0,25 + 128,5
=128,5 x 2 +128,5 x 3 +128,5 x 4 +128,5 x 1
=128,5 x ( 2 + 3 + 4 + 1 )
=128,5 x 10
=1285
b) 17,2 x 9,55 + 9,45 x 17,2 + 17,2
= 17,2 x 9,55 + 9,45 x 17,2 + 17,2 x 1
=17,2 x ( 9,55 +9,45 + 1 )
=17,2 x 20
=344
c) 6,45 : 0,2 + 6,45 : 0,25 + 6,45 - 6,45 : 0,1
=6,45 x 5 + 6,45 x 4 +6,45 x 1 + 6,45 x 10
=6,45 x (5 +4+1+10)
=6,45x20
=129
d) 1/2 : 0,5 - 1/4 : 0,25 + 1/8 : 0,125 - 1/10 : 0,1
=0,5;0,5-0,25:0,25+0,125:0,125-0,1:0,1
=1-1+1-1
=0
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4 ÷ 0,25 + 24,8 × 0,5 - 3 : 0,125
= 16 + 12,4 - 24
= 28,4 - 24
= 4,4
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\(a)101\times0,75-0,75\)
\(=0,75\times(101-1)\)
\(=0,75\times100=75\)
___________________________________________
`b)10:0,5+4:0,25+8:0,125`
\(=10\times2+4\times4+8\times8\)
\(=5\times4+4\times4+4\times16\)
\(=4\times(5+4+16)\)
\(=4\times25=100\)
a)101×0,75−0,75
=0,75\times(101-1)=0,75×(101−1)
=0,75\times100=75=0,75×100=75
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b)10:0,5+4:0,25+8:0,125b)10:0,5+4:0,25+8:0,125
=10\times2+4\times4+8\times8=10×2+4×4+8×8
=5\times4+4\times4+4\times16=5×4+4×4+4×16
=4\times(5+4+16)=4×(5+4+16)
=4\times25=100=4×25=100
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13,25 : 0,5 + 13,25 : 0,25 + 13,25 : 0,125
=13.25*2+13.25*4+13.25*8
=13.25*(2+4+8)
=13.25*14
=185.5
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\(\dfrac{1}{4}\) : 0,25 - \(\dfrac{1}{8}\) : 0,125 + \(\dfrac{1}{2}\) : 0,5 - 1
= 0,25 x 4 - 0,125 x 8 + 0,5 x 2 - 1
= 1 - 1 + 1 - 1
= 0 + 1 - 1
= 1 - 1
= 0
A = \(\dfrac{1}{4}\) : 0,25 - \(\dfrac{1}{8}\): 0,125 + \(\dfrac{1}{2}\): 0,5 - 1
A = \(\dfrac{1}{4}\) x 4 - \(\dfrac{1}{8}\) x 8 + \(\dfrac{1}{2}\) x 2 - 1
A = 1 - 1 + 1 - 1
A = (1 - 1) + (1 - 1)
A = 0
kho nhi
to lam duoc nhung ko chac la dung! nen to ko dang len dau
so dang len nhung sai thi cau lai chui to
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