1994+199.4+19.94+1.994=?199999+19999+1999+199+19=?
问题描述:
1994+199.4+19.94+1.994=?199999+19999+1999+199+19=?
如何简便运算?
写出主要运算过程
答
1994+199.4+19.94+1.994=1994(1+0.1+0.01+0.001)=1994*1.111=1.111(2000-6)=2222-6.666=2215.334¬199999+19999+1999+199+19=200000+20000+2000+200+20-5=222220-5=222215