(1)-2分之1×(-3分之1 ) (2) -2分之1×4
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(1)-2分之1×(-3分之1 ) (2) -2分之1×4
(1)-2分之1×(-3分之1 ) (2) -2分之1×4
(1)-2分之1×(-3分之1 ) (2) -2分之1×4
(1)-2分之1×(-3分之1 )
= 2分之1×3分之1 (负负得正)
= 6分之1
(2) -2分之1×4
= -2