(X-1.8)²+2.75²=X² 求X等于多少
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(X-1.8)²+2.75²=X² 求X等于多少
(X-1.8)²+2.75²=X² 求X等于多少
(X-1.8)²+2.75²=X² 求X等于多少
(X-1.8)²+2.75²=X²
x方-3.6x+3.24+7.5625-x方=0
-3.6x=-10.8025
x=3
(X-1.8)²+2.75²=X²
-3.6x=-10.8025
x=3
(X-1.8)²-X²+2.75²= 0
平方差公式:(X-1.8-x)(X-1.8+x)+2.75²=0
-1.8(2x-1.8)+2.75²=0
1.8²+2.75²=3.6x
(略)