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x varies directly as y but inversely as z.if y is increased

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x varies directly as y but inversely as z.if y is increased by 30% and z is decreased by 30%,how does x vary?
x varies directly as y but inversely as z.if y is increased
本人英语水平有限,恕无法用英语回答~!
这是一题数学上的比例问题.
X正比于Y,即设X=KY,则当Y上升30﹪时,X也上升30﹪,即1.3X;
且X反比于Z,即X正比于1/Z,所以设X=K·1/Z,Z下降30%,则变为(10/7)·X.
所以,两个X是不同的!Understand?
就这样了!o(-"-)o