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= (-43/15 * (11/60) + 0,98)
= (-473/900 + 0,98)
= 409/900 --> En decimal: 0,454
B) -12/5 + (5/6 * (1/4+0,86) - 0,33) + 8/4= -12/5 + (5/6 *(111/100)-0,33) + 8/4
= -12/5 + (37/40 -0,33) + 8/4
= -12/5 + (119/200) + 8/4
= -361/200 + 8/4
= 39/200 ---> En decimal: 0,195
C) -(-(2/3 *(0,23)+ (0.86 - 0,45))) = -(-(2/3*0,23) + (41/100)))
= 23/1500 + 41/100
= 169/300 ---> En decimal: 0,563