_ .... JI..\\..Il'-'.llAII,A,.ll learning of mathematics, generally learners...... _Jl..Jl..Jl..lI,A..... JI.. ...........' ....... to ask questions and argunlents throug11a process in-group negotiation, and reflection so thatthey could formulate conjectures and conclusions.collaborative research conducted throughproblem-based and focused onmathematical reasoning ability of junior high school-.'L' .....ยท .......... _' ...... U ...ALLJI ...... _ .......:J were forty-six students of Grade 2BBandung, a state junior higl1 school. Thethe research were tests on reasoning ability,sheets, students' diaries/journals, andresearch results indicate that the learning
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