5.1×0.3×5.2×0.3+5.3×0.3+5.4×0.3…+5.9×0.3怎么算？
2个回答
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5.1×0.3+5.2×0.3+5.3×0.3+……+5.9×0.3
=（5.1+5.2+5.3+……+5.9）×0.3
=[（5.1+5.9）×4+5.5]×0.3
=（11×4+5.5）×0.3
=49.5×0.3
=（50-0.5）×0.3
=15-0.15
=14.85
=（5.1+5.2+5.3+……+5.9）×0.3
=[（5.1+5.9）×4+5.5]×0.3
=（11×4+5.5）×0.3
=49.5×0.3
=（50-0.5）×0.3
=15-0.15
=14.85
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