15.8×5.8+4.2×4.2+11.6×4.2用简便方法算
问题描述:
15.8×5.8+4.2×4.2+11.6×4.2用简便方法算
答
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+4.2×15.8
=15.8×(5.8+4.2)
=15.8×10
=158