计算下面各题,能简算的要用简便方法算.4÷45-45÷438×1.25+15÷80%+1.25×2718×58+18×41+1813×(213+211×11)(38+127)×16+112737×115+47÷15.
计算下面各题,能简算的要用简便方法算. 4÷-÷4 | 38×1.25+15÷80%+1.25×27 | ×58+×41+ |
13×(+×11 ) | (+)×16+ | ×+÷15. |
答案和解析
(1)4÷
-÷4,
=4×-×,
=5-,
=4;
(2)38×1.25+15÷80%+1.25×27,
=(38+27)×1.25+15÷,
=65×+15×,
=(65+15)×,
=80×,
=100;
(3)×58+×41+,
=(58+41+1)×,
=100×,
=12.5;
(4)13×(+×11),
=13×(+2),
=13×+13×2,
=2+26,
=28;
(5)(+)×16+,
=×16+×16+,
=6+(+),
=6+1,
=7.
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