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maths:about rate&ratio(贈送20點)

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1.given that 4:(y+7)=7:(3y+16),find y 2.given that (y+4):y=5:6,find y 3. the ratio of the interior angles of a triangle is 4:2:3,find the smallest angle. (you can only answer one question)

最佳解答:

The question 1 7(y+7)=4(3y+16) 7y+49=12y+64 5y=-15 y= -3

其他解答:

1. 4:(y+7) = 7:(3y+16) 4/(y+7) = 7/(3y+16) (y+7)(3y+16) = 7(4) 4y+7+16 = 28 4y+23 = 28 4y = 28-5 4y = 5 y = 5/4 y =1.25 2. (y+4):y = 5:6 (y+4)/y = 5/6 6(y+4) = 5y 6y+24 =5y 24 = 5y-6y 24 =-y y = -24 3. The smallest angle = 180。x 2/4+2+3 = 180。x 2/9 = 40。|||||1.given that 4:(y+7)=7:(3y+16),find y 4/(y+7)=7/(3y+16) 12y+64=7y+49 5y=--15 y=-3 2.given that (y+4):y=5:6,find y (y+4)/y=5/6 6y+24=5y y=-24 3. the ratio of the interior angles of a triangle is 4:2:3,find the smallest angle. 2/(4+2+3)x360° =2/9x360° =80°
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