15.8*6.8+15.8*2.2+4.2*9怎样简便计算
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15.8*6.8+15.8*2.2+4.2*9怎样简便计算
![15.8*6.8+15.8*2.2+4.2*9怎样简便计算](/uploads/image/z/18136161-9-1.jpg?t=15.8%2A6.8%2B15.8%2A2.2%2B4.2%2A9%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
15.8×6.8+15.8×2.2+4.2×9
=15.8×(6.8+2.2)+4.2×9
=15.8×9+4.2×9
=9×(15.8+4.2)
=9×20
=180
=15.8×(6.8+2.2)+4.2×9
=15.8×9+4.2×9
=9×(15.8+4.2)
=9×20
=180