標題:
maths questions
發問:
1.Change subject1/f=1/u+1/v [v] 2.Simplify ratios1/2:1:1/7 3.Expand(a-b)(a2+ab+b2) 4.Factorize a2+a-42 5.Simplify ym*ym-(y2)m
最佳解答:
1.Change subject1/f=1/u+1/v [v] 1/f=1/u+1/v 1/v = 1/f - 1/u 1/v = (u-f)/uf v = uf/(u-f) 2.Simplify ratios1/2:1:1/7 1/2:1:1/7 = 7:14:2 <--- times 14 for both 3.Expand(a-b)(a2+ab+b2) (a-b)(a^2+ab+b^2) = a^3 - b^3 4.Factorize a2+a-42 a^2+a-42 = (a+7)(a-6) 5.Simplify ym*ym-(y2)m y^m*y^m-(y^2)^m = y*(m+m) - y^2m = y^2m - y^2m = 0
其他解答:
maths questions
發問:
1.Change subject1/f=1/u+1/v [v] 2.Simplify ratios1/2:1:1/7 3.Expand(a-b)(a2+ab+b2) 4.Factorize a2+a-42 5.Simplify ym*ym-(y2)m
最佳解答:
1.Change subject1/f=1/u+1/v [v] 1/f=1/u+1/v 1/v = 1/f - 1/u 1/v = (u-f)/uf v = uf/(u-f) 2.Simplify ratios1/2:1:1/7 1/2:1:1/7 = 7:14:2 <--- times 14 for both 3.Expand(a-b)(a2+ab+b2) (a-b)(a^2+ab+b^2) = a^3 - b^3 4.Factorize a2+a-42 a^2+a-42 = (a+7)(a-6) 5.Simplify ym*ym-(y2)m y^m*y^m-(y^2)^m = y*(m+m) - y^2m = y^2m - y^2m = 0
其他解答:
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