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78-26= 52, 100-28= 72, 200-70=130
7x12= 84, 24x3=72, 3x4=12
30/5=6, 200/5=40, 1000/25= 40
25.4+13.6=39, 89.5=+1.5, 2.2+0.8=3
51.4-21.4= 30, 84.5-0.5=84, 23.7-5.7= 16
0.5 x 4=2, .12 x 100=12, 0.4 x 5=2
20/.5= 40, 30/.3=100, 86/.5=172
lo de las fracciones no entendí, pero espero esto te ayude.