15.8×5.8+4.2×4.2+11.6×4.2用简便方法算

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15.8×5.8+4.2×4.2+11.6×4.2用简便方法算15.8×5.8+4.2×4.2+11.6×4.2用简便方法算15.8×5.8+4.2×4.2+11.6×4.2用简便方法算15.8×5.

15.8×5.8+4.2×4.2+11.6×4.2用简便方法算
15.8×5.8+4.2×4.2+11.6×4.2用简便方法算

15.8×5.8+4.2×4.2+11.6×4.2用简便方法算
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