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35 x 3/4 + 45,5 x 75/100 + 20,5 x 75% - 0,75
= 35 x 0,75 + 45,5 x 0,75 + 20,5 x 0,75 - 0,75 x 1
= ( 35 + 45,5 + 20,5 - 1 ) x 0,75
= 100 x 0,75
= 75
=3/4.0,25+3/4.1,25-3/4.0,5
=3/4.(0,25+1,25-0,5)
=3/4.10
=15/2
( 3092 x 0,75 - 408 x 3/4 ) : 6/4
= ( 3092 x 0,75 - 408 x 0.75 ) x 4/6
= 0,75 x (3092- 408) x 4/6
= 3/4 x 2684 x 4/6
= 12/24 x 2684
= 0,5 x 2684
= 1342
(3092 x 0,75 - 408 x 3 phần 4) : 6 phần 4
=(2319 - 306 ) : 6 phần 4
= 2013 : 6 phần 4
= 1342
a) \(0,75x99+\dfrac{3}{4}=\dfrac{3}{4}x99+\dfrac{3}{4}=\dfrac{3}{4}x\left(99+1\right)=\dfrac{3}{4}x100=75\)
b) \(3,05x8+9,15-3,05=3,05x8+3x3,05-3,05=3,05x\left(8+3-1\right)=3,05x10=30,5\)
\(\frac{30}{11}\times\frac{66}{25}\times\frac{75}{210}\)
\(=\frac{30\times6\times11\times3\times25}{11\times25\times30\times7}\)
\(=\frac{18}{7}\)
\(\left(\frac{8}{11}+\frac{3}{12}\right)+\frac{3}{11}\)
\(=\frac{8}{11}+\frac{3}{12}+\frac{3}{11}\)
\(=\left(\frac{8}{11}+\frac{3}{11}\right)+\frac{3}{12}\)
\(=1+\frac{3}{12}\)
\(=\frac{5}{4}\)
Matcha
\(\frac{30}{11}\times\frac{66}{25}\times\frac{75}{210}\)
\(=\frac{30\times66\times75}{11\times25\times210}\)
\(=\frac{1\times6\times3}{1\times1\times7}\)
\(=\frac{18}{7}\)
\(\left(\frac{8}{11}+\frac{3}{12}\right)+\frac{3}{11}\)
\(=\frac{8}{11}+\frac{3}{12}+\frac{3}{11}\)
\(=1+\frac{3}{12}\)
\(=1+\frac{1}{4}\)
\(=\frac{5}{4}\)
`@` `\text {Ans}`
`\downarrow`
`a)`
`20 \times 6 \times 5 \times 7`
`= (6 \times 7) \times (20 \times 5)`
`= 42 \times 100`
`= 4200`
`b)`
`125 \times 789 \times 8`
`= (125 \times 8) \times 789`
`= 1000 \times 789`
`= 789000`
`c)`
`2 \times 3 \times 4 \times 8 \times 50 \times 25 \times 125`
`= (2 \times 50) \times 3 \times (4 \times 25) \times (8 \times 125)`
`= 100 \times 3 \times 100 \times 1000`
`= 300000000`
