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-1,5 ×( -2 4/9) = -15/10 × (-22/9) = 55/15 = 3 10/15
b)
-2 4/9 ÷2,75 = -22/9 × 100/275 = -2200/2475 = -8/9
c)
2,75 ×( -3,6 )= -9,9
d)
-3,6 : 2 2/3 = -36/10 × 3/8= -27/20 = -1 7/20
-2 4/9 : 2,75 = -22/9 : 2 3/4 = -22/9 * 4/11 = -88/99
2,75 *-3,6 = 2 3/4 * -3 3/5= 11/4 * -18/5 = -198/20
-3,6 : 2 2/3 = - 18/5 : 8/3 = 18/5 * 3/8 = -54/40