Toán lớp 7 nhé !!

Question

1.A)(0,6)^5/(0,2)^6

   B)6^3+3.6^2+3^3/ -13

 

Comments

nhanh cần gấp nha

Answer 1

1.A)(0,6)^5/(0,2)^6=(0,5)^5/(0,2).(0,5)^5=1/0,2.(0,6/0,2)^5=5.243=1215

 B)6^3+3.6^2+3^3/ -13=2^3.3^3+3.2^2.3^2+3^2/-13=3^3.2^3+3^3.2^2+3^3/-13=3^3.(2^3+2^2+1)/-13=27.(-13)/-13=27.1/-1=-27

3.Tính 

a)(1+2/3-1/4) . (4/5 - 3/4)^2 =17/12.(1/20)^2=17/12.1/400=17/4800

 b)2 :(1/2 -2/3)^3=2:(-1/6)^3=2:-1/216=2.-216=-432