求下列格式中X的值 (1)3x²=75 (2)2(x-1)²=9/8 (3)2(x²+1)=10
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求下列格式中X的值 (1)3x²=75 (2)2(x-1)²=9/8 (3)2(x²+1)=10
求下列格式中X的值 (1)3x²=75 (2)2(x-1)²=9/8 (3)2(x²+1)=10
求下列格式中X的值 (1)3x²=75 (2)2(x-1)²=9/8 (3)2(x²+1)=10
(1)3x²=75
x²=25
x=±5
(2)2(x-1)²=9/8
(x-1)²=9/16
x-1=±3/4
x=1±3/4
x=7/4或1/4
(3)2(x²+1)=10
x²+1=5
x²=4
x=±2
(1) 3x²=75 x²=25 x=±5
(2) 2(x-1)²=9/8
(x-1)²=9/16
x-1=±3/4
x=1±3/4
(3) 2(x²+1)=10
x²+1=5
x²=4
x=±2
(1)x = 5或—5;
(2) x = 7/4或1/4;
(3) x = 2或-2;
(1)x=+-5
(2)x1=7/4,x2=1/4
(3)x=+-2
(1)3x²=75
3x²÷3=75÷3
x²=25
x=±5
(2)2(x-1)²=9/8
2(x-1)²÷2=9/8÷2
(x-1)²=9/16
x-1=±3/4
...
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(1)3x²=75
3x²÷3=75÷3
x²=25
x=±5
(2)2(x-1)²=9/8
2(x-1)²÷2=9/8÷2
(x-1)²=9/16
x-1=±3/4
x= 7/4或x=1/4
(3)2(x²+1)=10
2(x²+1)÷2=10÷2
x²+1=5
x²+1-1=5-1
x²=4
x=±2
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(1)x²=75÷3
x²=25
x=±5
(2)2(x-1)²=9/8
(x-1)²=9/4
x-1=±3/2
x=±3/2-1
x1=1/2
...
全部展开
(1)x²=75÷3
x²=25
x=±5
(2)2(x-1)²=9/8
(x-1)²=9/4
x-1=±3/2
x=±3/2-1
x1=1/2
x2=-5/2
(3)2(x²+1)=10
x²+1=5
x²=4
x=±2
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