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b)2[1/4]-0,2 = 2,25 - 0,2 = 2.05
c)1[1/4]×0,75 = 1 1/4 * 3/4 = 5/4 * 3/4 = 15/16
d)0,6÷[6/7] = 6/10 : 6/7 = 6/10 * 7/6 = 7/10
a)6[3/4]-(0,66+2,44) = 6,75 - 3,10 = 3,65
b)2,06+0,4÷1[3/5] = 2,06 + 4/10 : 8/5 = 2,06 + 4/10 * 5/8 = 2,06 + 1/4 = 2,06 + 0,25 = 2,31
2/3 * (2 4/5 + 0,65 ) = 2/3 * (2,8 + 0,65) = 2/3 * 3,45 = 2/3 * 345/100= 2/3 * 69/20 = 23/10 = 2,3