求x的值① (x-3)³=-1① (x-3)³=-1 ② 9(y+2)²-16=0 ③(x-3)²=3,④ 已知y=³√x+4分之√x²-16+√16-x²+1,求2x+5y,
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![求x的值① (x-3)³=-1① (x-3)³=-1 ② 9(y+2)²-16=0 ③(x-3)²=3,④ 已知y=³√x+4分之√x²-16+√16-x²+1,求2x+5y,](/uploads/image/z/3819052-28-2.jpg?t=%E6%B1%82x%E7%9A%84%E5%80%BC%E2%91%A0+%28x-3%29%26%23179%3B%3D-1%E2%91%A0+%28x-3%29%26%23179%3B%3D-1+%E2%91%A1+9%28y%2B2%29%26%23178%3B-16%3D0+%E2%91%A2%28x-3%29%26%23178%3B%3D3%2C%E2%91%A3+%E5%B7%B2%E7%9F%A5y%3D%26%23179%3B%E2%88%9Ax%2B4%E5%88%86%E4%B9%8B%E2%88%9Ax%26%23178%3B-16%2B%E2%88%9A16-x%26%23178%3B%2B1%2C%E6%B1%822x%2B5y%2C)
求x的值① (x-3)³=-1① (x-3)³=-1 ② 9(y+2)²-16=0 ③(x-3)²=3,④ 已知y=³√x+4分之√x²-16+√16-x²+1,求2x+5y,
求x的值① (x-3)³=-1
① (x-3)³=-1 ② 9(y+2)²-16=0 ③(x-3)²=3,
④ 已知y=³√x+4分之√x²-16+√16-x²+1,求2x+5y,
求x的值① (x-3)³=-1① (x-3)³=-1 ② 9(y+2)²-16=0 ③(x-3)²=3,④ 已知y=³√x+4分之√x²-16+√16-x²+1,求2x+5y,
1 x-3=-1
x=2
2 (y+2)²=16/9
(y+2)=±4/3
y1=-2/3
y2=-10/3
3 x-3=±√3
x1=√3+3
x2=-√3+3
4
因为
x²-16≥0
x≥4或x≤-4
16-x²≥0
-4≤x≤4
所以x=4 y=1/2
2x+5y=2*4+5/2
=8+2.5
=10.5
① (x-3)³=-1
x-3=-1
x=2
② 9(y+2)²-16=0
9(y+2)²=16
(y+2)²=16/9
y+2=±4/3
y1=-2/3, y2=-10/3
③(x-3)²=3
x-3=±√3
x1=3+√3, x2...
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① (x-3)³=-1
x-3=-1
x=2
② 9(y+2)²-16=0
9(y+2)²=16
(y+2)²=16/9
y+2=±4/3
y1=-2/3, y2=-10/3
③(x-3)²=3
x-3=±√3
x1=3+√3, x2=3-√3
4. ﹛x²-16≥0
16-x²≥0
∴x²-16=0
x=±4
∵x+4≠0
∴取x=4
代入得 y=½
2x+5y=2×4+5×½=10.5
收起
(1)x-3=-1,x=2
(2)y+2=4/3 或y+2=-4/3
所以y=-2/3 huoy=-10/3
先给分再答案
∵(x-3)三次方=-1 ∴x-3=-1 ∴x=2 ∵原式=0 ∴9(y+2)²=16 ∴y+2=4/3 ∴y=-2/3 x-3=根号3 ∴x=根号3-3