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(1)24×75=1800

(24______6)×(75×6)=1800

(24______3)×(75______□)=1800

(2)108÷36=3

(108×4)÷(36______4)=3

(108______□)÷(36______□)=3.

答案

(1)24×75=1800

(24÷6)×(75×6)=1800

(24×3)×(75÷3)=1800

(2)108÷36=3

(108×4)÷(36×4)=3

(108×2)÷(36×2)=3

故答案为:÷,×,÷,3;×,×,2,×,2.

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