8x2.58+0.5+1.42x1.8简便算法？
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8×2.58+0.5+1.42×1.8
=10×2.58-2×2.58+0.5+1.42×2-1.42×0.2
=25.8-5.16+0.5+2.84-0.284
=（25.8+0.5+2.84）-（5.16+0.284）
=（26.3+2.84）-5.444
=29.14-6+0.556
=23.14+0.556
=23.696
=10×2.58-2×2.58+0.5+1.42×2-1.42×0.2
=25.8-5.16+0.5+2.84-0.284
=（25.8+0.5+2.84）-（5.16+0.284）
=（26.3+2.84）-5.444
=29.14-6+0.556
=23.14+0.556
=23.696
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