问题
解答题
用简便方法计算下面各题.
43.6+9.8+6.4;7.3×0.25×8;2.31×1.5+1.5×7.69.
答案
①43.6+9.8+6.4
=(43.6+6.4)+9.8
=50+9.8
=59.8;
②7.3×0.25×8
=7.3×(0.25×8)
=7.3×2
=14.6;
③2.31×1.5+1.5×7.69
=(2.31+7.69)×1.5
=10×1.5
=15.
用简便方法计算下面各题.
43.6+9.8+6.4;7.3×0.25×8;2.31×1.5+1.5×7.69.
①43.6+9.8+6.4
=(43.6+6.4)+9.8
=50+9.8
=59.8;
②7.3×0.25×8
=7.3×(0.25×8)
=7.3×2
=14.6;
③2.31×1.5+1.5×7.69
=(2.31+7.69)×1.5
=10×1.5
=15.