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\(1,25\times59,7\times800\\ =\left(1,25\times800\right)\times59,7\\ =1000\times59,7\\ =59700\)
=1,25 x 59,7 x 800
=(1,25 x 800) x 59,7
=1000 x 59,7
=59700
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a, \(=16,24\left(12-3+1\right)\)
\(=16,24.10=162,4\)
b, \(=1,25\left(1+2+7\right)\)
\(=1,25.10=12,5\)
c, \(=2,46\left(2+8\right)\)
\(=2,46.10=24,6\)
\(a,=16,24\times12-16,24\times3+16,24\times1\\ =16,24\times\left(12-3+1\right)=16,24\times10=162,4\\ b,=1,25\times\left(1+2+7\right)=1,25\times10=12,5\)
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a) \(6,25+8,75+3,75+1,25=6,25+3,75+8,75+1,25=10+10=20\)
b) \(7,15:0,5+7,15x9-7,15=7,15x\left(1:0,5+7,19-1\right)=7,15x\left(2+9-1\right)=7,15x10=71,5\)
`@` `\text {Ans}`
`\downarrow`
`a)`
`6,25 + 8,75 + 3,75 + 1,25 `
`= (6,25 + 3,75) + (8,75 + 1,25)`
`= 10 +10 = 20`
`b)`
` 7,15 \div 0,5 + 7,15 \times 9 - 7,15 `
`= 7,15 \times 2 + 7,15 \times 9 - 7,15 \times 1`
`= 7,15 \times ( 2+ 9 - 1)`
`= 7,15 \times 10`
`= 71,5`
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= ( 1,25 x 8 ) x ( 4 x 0,25 ) x ( 0,5 x 8 ) x 135,3
= 10 x 1 x 4 x 135,3
= 10 x 4 x 135,3
= 40 x 135,3
= 5412
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2 x 3,12 x 1,25 : 0,25 x 10
= 6,24 x 1,25 x 4 x 10
= 6,24 x 5 x 10
= 6,24 x 50
= 312
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a)`1,25 + 1,25 xx 2 + 7 xx 1,25=1,25 xx (1+2+7) = 1,25 xx 10 =12,5`
b)`3,62xx12–2xx0,362xx10=3,62 xx 12 -2 xx 3,62=3,62xx(12-2)=3,62xx10=36,2`
c)`12,35xx15–1,235xx10xx6+12,35=12,35xx15–12,35xx6+12,35=12,35xx(15-6+1)=12,35xx10=123,5`
d)`1,42 : 0,5 + 1,42 xx 8=1,42xx2+1,42xx8=1,42xx(2+8)=1,42xx10=14,2`
![](https://rs.olm.vn/images/avt/0.png?1311)