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数学
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(1)若|m-3|+(n-4)²=0,则2m-3n=?(2)若x²=9,(y-1)³=0,则x+2y=?
人气:335 ℃ 时间:2020-05-20 05:07:06
解答
(1)m=3,n=4
2m-3n=6-12=-6
(2)x=±3
y=1
x=3时
x+2y=5
x=-3时
x+2y=-1
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