Answers

✨ Best Answer ✨

(4)
a◎b=a/2-b このとき、a=x+y、b=x-y
と置き換えると、

(x+y)/2-(x-y) 通分して、
={(x+y)-2(x-y)}/2
=(-x+3y)/2

(5)
もとの円錐の底面の半径をr、高さをhとすると、
元の体積=1/3×πr²×h=1/3πr²h

半径の1/2は1/2r、高さの5倍は5hから、
変更した体積=1/3×(1/2r)²π×5h
 =1/3×1/4r²π×5h
 =5/12πr²h

5/12πr²h÷1/3πr²h=5/4倍

Post A Comment

Answers

(4) (ーx+3y)/2 または,-(1/2)x+(3/2)y

(5) (1/2)²×5=5/4 倍

Post A Comment
Were you able to resolve your confusion?

Users viewing this question
are also looking at these questions 😉