几道数学计算的化简题
问题描述:
几道数学计算的化简题
(1)(√2+1)(√2-1);
(2)√32÷√2
答
(1)
(√2+1)(√2-1)
=(√2)²-1²
=2-1
=1
(2)
√32÷√2
=√(16×2)÷√2
=√(4²×2)÷√2
=4√2÷√2
=4