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20,10x35-19,45x65+20,10x65-19,45x35
=(35+65)x20,10+(35+65)x19,45
=100x20,10-100x19,45
=100x(20,10-19,45)
=100x0,65=65
= 35*(20,10-19,45)+65*(20,10-19,45)
=35*0,65+65*0,65
=0,65*(35+65)
=0,65*100
=65
1,25 x 15,32 x 0,008 + 15,32 x 0,09
= (1,25 x 0,008) x 15,32 + 15,32 x 0,09
= 0,01 x 15,32 + 15,32 x 0,09
= (0,01 x 0,09) x 15,32
= 0,1 x 15,32
= 1,532
#Học tốt!!!
~NTTH~
\(\frac{4}{5}x\frac{1}{20\%}+0,08=4,08\)
\(2001:25-1999:25=0,08\)
\(75x1,25=93,75\)
\(56x2,5x400=56000\)
\(1600:1,25=1280\)
\(k\)\(nha♥♥♥♥\)
Bài 1 :
\(2:1,25+0,8\times0,5-1\)
\(=1,6+0,4-1\)
\(=2-1\)
\(=1\)
Bài 2 :
\(A\times1,25+2,5=1,25\times9\)
\(\Rightarrow A\times1,25+2\times1,25=1,25\times9\)
\(\Rightarrow1,25\times\left(A+2\right)=1,25\times9\)
\(\Rightarrow A+2=9\)
\(\Rightarrow A=9-2\)
\(\Rightarrow A=7\)
Vậy \(A=7\)
`@` `\text {Ans}`
`\downarrow`
`a,`
`93,57 \times 19,45 - 93,57 \times 9,45`
`= 93,57 \times (19,45 - 9,45)`
`= 93,57 \times 10`
`= 935,7`
`b,`
`815,5 \times 0,08 + 815,5 \times 0,02`
`= 815,5 \times (0,08 + 0,02)`
`= 815,5 \times 0,1`
`= 81,55`
`c,`
`11 \times 46,79 - 46,79`
`= 46,79 \times (11 - 1)`
`= 46,79 \times 10`
`= 467,9`
`d,`
`92,305 \times 108 - 92,305 \times 8`
`= 92,305 \times (108 - 8)`
`= 92,305 \times 100`
`= 9230,5`
`e,`
`189,28 \times 78 - 189,28 \times 68`
`= 189,28 \times (78 - 68)`
`= 189,28 \times 10`
`= 1892,8`
a) \(93,57\times19,45-93,57\times9,45\)
\(=93,57\times\left(19,45-9,45\right)\)
\(=93,57\times10\)
\(=935,7\)
b) \(815,5\times0,08+815,5\times0,02\)
\(=815,5\times\left(0,08+0,02\right)\)
\(=815,5\times0,1\)
\(=81,55\)
c) \(11\times46,72-46,79\)
\(=46,79\times\left(11-1\right)\)
\(=46,79\times10\)
\(=467,9\)
d) \(92,305\times108-92,305\times8\)
\(=92,305\times\left(108-8\right)\)
\(=92,305\times100\)
\(=9230,5\)
e) \(189,28\times78-189,28\times68\)
\(=189,28\times\left(78-68\right)\)
\(=189,28\times10\)
\(=1892,8\)
19,45*30,4+69,6*19,45 =19,5*(30,4+69,6)=19,5*100=1950
a)19,45 x 30,4 + 69,6 x 19,45
= 19,45 x ( 30,4 + 69,6 )
= 19,45 x 100
= 1945
b)148,6 x 0,09 - 0,08 x 148,6
= 148,6 x ( 0,09 - 0,08 )
= 148,6 x 0,01
= 1,486
c)82,05 : 1,25 - 69,55 : 1,25
= 1,25 : ( 82,05 - 69,55 )
= 1,25 : 12,5
= 0,1
d) ( 123,6 x 3,85 ) : 41,2
= ( 123,6 : 41,2 ) x 3,85
= 3 : 3,85
= 0,78