19.94-19.91+19.88-19.85+19.82-……+1.04-1.01简便计算
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19.94-19.91+19.88-19.85+19.82-……+1.04-1.01简便计算
19.94-19.91+19.88-19.85+19.82-……+1.04-1.01简便计算
19.94-19.91+19.88-19.85+19.82-……+1.04-1.01简便计算
19.94-19.91+19.88-19.85+19.82-……+1.04-1.01
=(19.94-19.91)+(19.88-19.85)+(19.82-19.79)……+(1.04-1.01)
=0.03*[(19.94-1.04)÷0.06+1]
=0.03*316
=9.48
每两项之差是0.03,共630项,所以原式=0.03*630*1/2=9.45
0.03*1890=56.7
2项之差是0.03,设从19.94到1.0要用x个0.03,和那个1加到100是一个道理,共有630项,等差数列求和公式:等差数列的和=(首数+尾数)*项数/2;
项数的公式:等差数列的项数=[(尾数-首数)/公差]+1. 按着这个算的话,0.03*630*1/2=9.45
19.94-19.91+19.88-19.85+19.82-……+1.04-1.01简便计算
19.88+9.9*198.8(简算)
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
1.1994+199.4+19.94+1.994
1994+199.4+19.94+1.994
19.94+99.7×99.8
简便方法 19.88+9.9*198.8
20.06×1995-19.94×2006
巧算:1994+199.4+19.94+1.994
19.94+99.7×99.8 help me
用简便方法计算:19.88+9.9+198.8
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991=?(简便方法)
简算题1991+199.1+19.91+1.991=
1991+199.1+19.91+1.991
巧算题求解1991+199.1+19.91+1.991
简便计算:20.06×1995-19.94×2006
20.11乘1995减19.94乘2011