用简便算法计算下列算式. 3.78×2.2+1.7×1.22+1.12×0.5.

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问题 用简便算法计算下列算式.
3.78×2.2+1.7×1.22+1.12×0.5.

选项

答案3.78×2.2+1.7×1.22+1.12×0.5 =3.78×2.2+1.7×1.22+(1.22—0.1)×0.5 =3.78×2.2+(1.7+0.5)×1.22—0.1×0.5 =3.78×2.2+2.2×1.22—0.05 =(3.78+1.22)×2.2—0.05 =5×2.2—0.05 =11一0.05 =10.95

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