2.7*1.3=()*0.13=0.27*()=0.027*()=()*0.013

2.7*1.3=()*0.13=0.27*()=0.027*()=()*0.013

2.7*1.3=(27)*0.13=0.27*(13)=0.027*(130)=(270)*0.013
Hope to help you

① (2) 41 / 64 + 0.81 × 36 + 1 / 2 √ 0.25
③（-2x）²+（6x³-12x^4）÷（3x²） ④a^12÷（a^8÷a²）×a³

①³√8/27-³√0.027+（-³√1/2）³
=2/3-0.3-1/2
=2/3-3/10-1/2
=-2/15
② √ 2 41 / 64 + √ 0.81 × 36 + 1 / 2 √ 0.25
=13/8+0.9×6+1/1
=13 / 8 + 5 and 2 / 5 + 1
=8 and 1 / 40
③（-2x）²+（6x³-12x^4）÷（3x²）
=4x^2+2x-4x^2
=2x
④a^12÷（a^8÷a²）×a³
=a^12÷a^6×a³
=a^9

6.81-1.2-3.8＝( ) 2.3+0.77+1.23+10.7
6.81-1.2-3.8＝( )
2.3+0.77+1.23+10.7＝( )

1.81
fifteen

0.75 + (- 11 / 4) + (+ 0.125) + (- 5 / 7) + (- 4 and 1 / 8)

-Six and five out of seven

- 0.125 △ (- 3 / 8)

Original form
=-1/8÷（-3/8)
=One third

What's the ratio of 9 to 13.5

=90:135=1:1.5=1:3/2=2:3

What's the ratio of five out of eleven to five out of thirteen?

5/11 :5/13=13/11
Five out of eleven to five out of thirteen = thirteen to eleven

13: 1 / 2 ratio

13:1/2=13*2=26

7 out of 18 to 14 out of 15

5:12

Simplify the ratio and calculate the ratio of 0.8:7 of 12 (I want to explain in detail)

0.8：7/12
=4 / 5 △ 7 / 12 (× reciprocal)
=4/5×12/7
=48/35