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F.3 Maths(送分的)
Find the value of x and y 3x + y = 2.2 7x + y = 3.8 更新: solidum點解你要delete答案? 更新 2: It is a easy question.
最佳解答:
3x + y = 2.2－－－(1) 7x + y = 3.8－－－(2) Form (1), y=2.2-3x－－－(3) sub (3) into (2) 7x+(2.2-3x)=3.8 4x=1.6 x=0.4 sub x=0.4 into (3) y=2.2-3(0.4) y=2.2-1.2 y=1.0
其他解答:
我明你想講咩 之後你又delete答案- - 我仲想選你做最佳- -|||||3x + y = 2.2 ----------(1) 7x + y = 3.8 -----------(2) (2) - (1): 7x+y - (3x+y) = 3.8 - 2.2 4x = 1.6 x = 0.4 sub x=0.4 into (1): 3(0.4) + y = 2.2 1.2 + y = 2.2 y = 1|||||呢題一定唔係F.3 呢題係 F.2 first term maths curriculum 第 5 課教|||||7x + y = 3.8 7x = 3.8 - y x = (3.8 - y) / 7 把以上代入x1 3 * ( (3.8 - y )/ 7 ) + y = 2.2 3 * ( (3.8 - y) / 7 ) = 2.2 - y (3.8 - y )/ 7 = (2.2 - y)/ 3 11.4 - 3y = 15.4 - 7y 4y = 4 y = 1 代入 x2 7x + 1 = 3.8 7x = 2.8 x = 0.4
F.3 Maths(送分的)
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發問:Find the value of x and y 3x + y = 2.2 7x + y = 3.8 更新: solidum點解你要delete答案? 更新 2: It is a easy question.
最佳解答:
3x + y = 2.2－－－(1) 7x + y = 3.8－－－(2) Form (1), y=2.2-3x－－－(3) sub (3) into (2) 7x+(2.2-3x)=3.8 4x=1.6 x=0.4 sub x=0.4 into (3) y=2.2-3(0.4) y=2.2-1.2 y=1.0
其他解答:
我明你想講咩 之後你又delete答案- - 我仲想選你做最佳- -|||||3x + y = 2.2 ----------(1) 7x + y = 3.8 -----------(2) (2) - (1): 7x+y - (3x+y) = 3.8 - 2.2 4x = 1.6 x = 0.4 sub x=0.4 into (1): 3(0.4) + y = 2.2 1.2 + y = 2.2 y = 1|||||呢題一定唔係F.3 呢題係 F.2 first term maths curriculum 第 5 課教|||||7x + y = 3.8 7x = 3.8 - y x = (3.8 - y) / 7 把以上代入x1 3 * ( (3.8 - y )/ 7 ) + y = 2.2 3 * ( (3.8 - y) / 7 ) = 2.2 - y (3.8 - y )/ 7 = (2.2 - y)/ 3 11.4 - 3y = 15.4 - 7y 4y = 4 y = 1 代入 x2 7x + 1 = 3.8 7x = 2.8 x = 0.4
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