BÀI 1. (2,5 ĐIỂM) THỰC HIỆN CÁC PHÉP TÍNH

3.6 18 9.2− −2= 12 + 5 +18= 12 ( 5) ( 2)+ − + −= 55 5 3 5 17− ⋅ + ⋅b) −11 11 2 11 2= 5 ⋅ + 5 3⋅ + 5 17⋅11 1 11 2 11 2 5 3 17= ⋅ + + 11 1 2 2 5 2 3 1711 2 2 2= 5 ⋅11 11

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1− − + −c)  75% 2 1, 4 2 2= 1 − 3 + 5 − 74 4 2 5 −  −153 7=  +  + +4 2 54−  −1 7=  +  +2 5 2= + −7= 10 + −75 5= 3