帮我解决以下的数学问题,谢谢!3.26×4.5＋5.2×3.26＋9.7×6.7415.8×5.8＋4.2×4.2＋11.6×4.2 这两题怎么简便算?
问题描述：
帮我解决以下的数学问题,谢谢!
3.26×4.5＋5.2×3.26＋9.7×6.74
15.8×5.8＋4.2×4.2＋11.6×4.2
这两题怎么简便算?
答
3.26×4.5＋5.2×3.26＋9.7×6.74
=3.26×(4.5＋5.2)＋9.7×6.74
=9.7×(3.26＋6.74)
=97
15.8×5.8＋4.2×4.2＋11.6×4.2
=15.8×5.8＋4.2×(4.2＋11.6)
=15.8×(5.8＋4.2)
=158
答
3.26×4.5＋5.2×3.26＋9.7×6.74= 3.26 * (4.5+5.2) + 9.7 * 6.74= 3.26 * 9.7 + 9.7 * 6.74= 9.7 * (3.26+6.74)= 9.7 * 10= 9715.8×5.8＋4.2×4.2＋11.6×4.2= 15.8 * 5.8 + 4.2 * (4.2+11.6)= 15.8 * 5.8 + 4.2 ...