a, 27.26+27.64

=27.(26+64)

=27.90

=2430

b,25.37+25.63-150

=25.(37+63)-150

=25.110-150

=2750-150

=2600

c,425.7.4=170.60

=1700.7=170.10.6

=1700.7-1700.6

=1700.(7-6)

=1700

d,0.9.14+6.17.12+19.4.18

=0+6.17.12+19.4.18

=6.3.4.17+19.4.18

=18.4.17+19.4.18

=18.4.(17+19)

=72.36=2592

Ta có:

425*27+425*72+425=425*(27+72+1)=425*100=42500

425x27+425x72+425

=425x27+425x72+425x1

=425x(27+72+1)

=425x100

=42500

425 x 27 + 425 x 72 + 425

= 425 x (27 + 72 + 1)

= 425 x 100

= 42500

Ta có: `a_[max]=40(m//s^2)`

   Mà `A=8(cm)=0,08(m)`

 `=>\omega=\sqrt{[a_[max]]/A}=10\sqrt{5}(rad//s)`

    `=>f=[\omega]/[2\pi]=[5\sqrt{5}]/[\pi] (Hz)`

425 x 32 + 69 x 425 - 425

= 425 x 32 + 69 x 425 - 425 x 1

= 425 x (32+69-1)

= 425 x 100

=  42500

1) \(7.4^x=7.4^3\Leftrightarrow4^x=4^3;x=3\)

2) \(\frac{3}{2.5^x}=\frac{3}{2.5^{12}}\Leftrightarrow5^x=5^{12};x=12\)

\(2^x=2.2^8=2^9;x=9\)

4) \(5.3^x=7.3^5-2.3^5\Leftrightarrow5.3^x=3^5.\left(7-2\right)\)

\(\Leftrightarrow3^5.x=3^5.5;x=5\)

\(\Leftrightarrow x-12=7\cdot4=28\)

hay x=40

= 48.(9.8+7.4)+52.(72+2.14)

=48.100+52.100

=100(48+52)

=100.100

=10000

đáp án =10000

`3/7 .4/11+3/7 .7/11-2`

`= 3/7 . ( 4/11 + 7/11)-2`

`= 3/7 . 11/11 -2`

`=3/7 . 1-2`

`= 3/7-2`

`= 3/7 - 14/7`

`=-11/7`

`3/7*4/11+3/7*7/11-2`

`=3/7*(4/11+7/11)-2`

`=3/7*1-2`

`=3/7-2`

`=3/7-14/7`

`=-11/7`

= -11/7