197+98=148-79=526-298=38+127+62=25×16=390÷5÷6=125×47×8=270÷54=
答案:2 悬赏:60 手机版
解决时间 2021-12-19 00:32
- 提问者网友:十年饮冰
- 2021-12-18 14:54
197+98=148-79=526-298=38+127+62=25×16=390÷5÷6=125×47×8=270÷54=
最佳答案
- 五星知识达人网友:纵马山川剑自提
- 2021-12-18 15:46
解:(1)197+98,
=197+100-2,
=297-2,
=295;
(2)148-79,
=148-80+1,
=68+1,
=69;
(3)526-298,
=526-300+2,
=226+2,
=228;
(4)38+127+62,
=38+162+127,
=200+127,
=327;
(5)25×16,
=25×(4×4),
=25×4×4,
=100×4,
=400;
(6)390÷5÷6,
=390÷(5×6),
=390÷30,
=13;
(7)125×47×8,
=125×8×47,
=1000×47,
=47000;
(8)270÷54,
=(270×2)÷54÷2,
=540÷54÷2,
=10÷2,
=5.解析分析:(1)(2)(3)根据凑整法简算;
(4)根据加法交换律简算;
(5)先把16分解成4×4,再运用乘法结合律简算;
(6)根据除法的性质简算;
(7)根据乘法交换律简算;
(8)根据商不变的规律计算.点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
=197+100-2,
=297-2,
=295;
(2)148-79,
=148-80+1,
=68+1,
=69;
(3)526-298,
=526-300+2,
=226+2,
=228;
(4)38+127+62,
=38+162+127,
=200+127,
=327;
(5)25×16,
=25×(4×4),
=25×4×4,
=100×4,
=400;
(6)390÷5÷6,
=390÷(5×6),
=390÷30,
=13;
(7)125×47×8,
=125×8×47,
=1000×47,
=47000;
(8)270÷54,
=(270×2)÷54÷2,
=540÷54÷2,
=10÷2,
=5.解析分析:(1)(2)(3)根据凑整法简算;
(4)根据加法交换律简算;
(5)先把16分解成4×4,再运用乘法结合律简算;
(6)根据除法的性质简算;
(7)根据乘法交换律简算;
(8)根据商不变的规律计算.点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
全部回答
- 1楼网友:你可爱的野爹
- 2021-12-18 17:07
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