199.7+997.1+977.1-1997.71
=200-0.3+1000-2.9+1000-22.9-2000+2.29
=200-(0.3+25.8)+2.29
=200-26.1+2.29
=176.19
祝开心
199.7+997.1+977.1-1997.71=?如何巧算?
3个回答
相关问题
-
1997+199.7+19.97+1.997+0.1997+0.01997
-
1/(1995*1996)+1/(1996*1997)+1/(1997*1998)+1/1998如何巧算
-
3.997+19.96+1.9998+199.7(简便运算)
-
巧算∶1.999+19.99+199.9+1999
-
巧算: 99*99+199 = = =
-
1997*1997-1996*1996的巧算方法
-
数学题计算与巧算（7）1,2,3,…,997这997个自然数的各位数字之和的总和是 27×498＋1=13447.
-
19971997+9971997+971997+71997+1997+997+97+7=______．
-
19971997+9971997+971997+71997+1997+997+97+7=______．
-
求方程x/1*3+x/3*5+x/5*7+.+x/1993*1997=997