1+0.23+0.456)×(0.23+0.456+0.789)—(0.1+0.23+0.456+0.789) ×(0.

1+0.23+0.456)×(0.23+0.456+0.789)—(0.1+0.23+0.456+0.789) ×(0.23+0.456)
ivyyo 1年前 已收到1个回答 举报
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zw1986616 春芽

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(0.1+0.23+0.456)×(0.23+0.456+0.789)—(0.1+0.23+0.456+0.789) ×(0.23+0.456)
=0.1×(0.23+0.456)+0.1×0.789+(0.23+0.456)×(0.23+0.456)+(0.23+0.456)×0.789-0.1×(0.23+0.456)-(0.23+0.456)×(0.23+0.456)-0.789×(0.23+0.456)
=0.1×0.789
=0.0789

1年前

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