expand 2pirh(r-h)

פתרון

expand

2 π r h (r - h)

2 πh r^{2} - 2 π h^{2} r

צעדי פתרון

2 π r h (r - h)

= 2 πh r (r - h)

a (b - c) = ab - a c

: פתח סוגריים בעזרת

a = 2 π r h, b = r, c = h

= 2 π r h r - 2 π r hh

= 2 πh rr - 2 πhh r

2 πh rr - 2 πhh r

פשט את:

2 πh r^{2} - 2 π h^{2} r

= 2 πh r^{2} - 2 π h^{2} r

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