除(12345678平方-12345677*12345679)
问题描述:
除(12345678平方-12345677*12345679)
答
除(12345678平方-12345677*12345679)
=[(9/7)²-16/7×2/7]÷[12345678²-(12345678-1)(12345678+1)]
=(81/49-32/49)÷(12345678²-12345678²+1)
=49/49÷1
=1
答
[(9/7)²-16/7×2/7]/[12345678-(12345678-1)(12345678+1)]
=81/49-32/49
=1