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\(a,=69,78\times\left(\dfrac{3}{4}+\dfrac{1}{4}+99\right)\\ =69,78\times\left(\dfrac{4}{4}+99\right)\\ =69,78\times\left(1+99\right)=69,78\times100=6978\\ b,34,1\times8+34,1\times0,5\\ =34,1\times\left(8+0,5\right)\\ =34,1\times8,5\\ =289,85\)
a: =69,78(3/4+1/4+99)
=69,78*100
=6978
b: =34,1(8+0,5)=34,1*8,5=289,85
Lời giải:
$=27\times 2+12,44\times 4+17,56\times 4+23\times 2$
$=2\times (27+23)+4\times (12,44+17,56)$
$=2\times 50+4\times 30$
$=100+120=220$
a) \(6,15:0,5+6,15:0,2+3x6,15\)
\(=6,15x\left(1:0,5+1:0,2+3\right)=6,15x\left(2+5+3\right)=6,15x10=61,5\)
b) \(0,215x74,24+25,76x0,215+18,5\)
\(=0,215x\left(74,24+25,76\right)+18,5=0,215x100+18,5=21,5+18,5=40\)
`@` `\text {Ans}`
`\downarrow`
`4,`
`a)`
\( 6,15 \div 0,5 + 6,15 \div 0,2 + 3 \times 6,15 \)
`= 6,15 \times 2 + 6,15 \times 5 + 3 \times 6,15`
`= 6,15 \times (2 + 5 + 3)`
`= 6,15 \times 10`
`= 61,5`
`b)`
`0,215 \times 74,24 + 25,76 \times 0,215 + 18,5 `
`= 0,215 \times (74,24 + 25,76) + 18,5`
`= 0,215 \times 100 + 18,5`
`= 21,5 + 18,5`
`=40`
\(12,5:0,5+12,5:0,25+12,5:0,125-12,5\times4\)
\(=12,5\times2+12,5\times4+12,5\times8-12,5\times4\)
\(=12,5\times\left(2+4+8-4\right)\)
\(=12,5\times10\)
\(=125\)
_HT_
= 12,5 x 2 + 12,5 x 4 + 12,5 x 8 - 12,5 x 4
= 12,5 x (2+4+8-4)
= 12,5 x 10
= 125
Ta có:
\(12,5:0,5+12,5:0,25+12,5:0,125-12,5×4\)
\(=12,5:\left(0,5+0,25+0,125\right)-12,5×4\)
\(=12,5×10\)
\(=125\)
`#3107.101107`
b)
\(0,5\times\dfrac{3}{4}-\dfrac{1}{2}\times\dfrac{1}{4}\\ =\dfrac{1}{2}\times\dfrac{3}{4}-\dfrac{1}{2}\times\dfrac{1}{4}\\ =\dfrac{1}{2}\times\left(\dfrac{3}{4}-\dfrac{1}{4}\right)\\=\dfrac{1}{2}\times\dfrac{1}{2}\\ =\dfrac{1}{4}\)