2个回答
(10+x)²=10²+(20一x)²
10²+20x+x²=10²+20²-40x+x²
20x=20²-40x
60x=400
x=20/3
(10+x)²=10²+（20-x）²
100+x²+20x=100+400-40x+x²
60x=400
x=20/3
(10+x)²=10²+(20一x)²
10²+20x+x²=10²+20²-40x+x²
20x=20²-40x
60x=400
x=20/3
(10+x)²=10²+（20-x）²
100+x²+20x=100+400-40x+x²
60x=400
x=20/3