用简便方法计算:(3.75+4.1+2.35)×9.8

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用简便方法计算:(3.75+4.1+2.35)×9.8
用简便方法计算:(3.75+4.1+2.35)×9.8

用简便方法计算:(3.75+4.1+2.35)×9.8
原式=(3.75+2.35+4.1)×(10-0.2)
=(3+2+4+0.75+0.35+0.1)×(10-0.2)
=(9+1.2)×(10-0.2)
=(10+0.2)×(10-0.2)
=10×10-0.2×0.2
=100-0.04
=99.96