﹣0.25?÷(0.5)? (1/8-1/2)×{(-1) a la décima potencia}
= - (1/4)? ÷(1/2)? (1/8 - 4/8) × 1
= - (1/16) ÷ (1/8) ( - 3/8)
= - 1/2 - 3/8
= - 7/8
-3×(menos tres tercios)-4×(1-dos-tercios) -8 (dos tercios al cuadrado)
= 9/2 - 4×1/3 - 8 ÷ (4/9)
= 9/2 - 4/3 - 8×9 /4
= 9/2 - 4/3 - 18
= 27/6 - 8/6 - 18
= 19/ 6 - 108/ 6
= - 89/6