问题 解答题
用简便方法计算.
6.3+8.7+8.7×3.71.5×8.4+3×0.3+15×10%
答案

(1)6.3+8.7+8.7×3.7,

=(6.3+8.7)+8.7×3.7,

=15+32.19,

=47.19;

(2)1.5×8.4+3×0.3+15×10%,

=1.5×8.4+0.9+1.5×1,

=1.5×(8.4+1)+0.9,

=1.5×9.4+0.9,

=1.5×(10-0.6)+0.9,

=15-0.9+0.9,

=15.

多项选择题
材料分析题