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= 3 × 125 / 5
= 375 / 5
= 75
II. 5/7 de 294
= 5 × 294 / 7
= 1470 / 7
= 210
III. 3/4 de 356
= 3 × 356 / 4
= 1068 / 4
= 267
IV. 4/6 de ... es 60
= 4/6 × x= 60
4x =360
x= 360/4
x= 90
V. 8/9 de ... es 160
= 8/9 × x = 160
8x = 1440
x = 1440/8
x = 180