Число, обратное двум: 1/2 (т. к. 2×1/2=1)
1) (2+1/2)²=2²+2×2×1/2+(1/2)²=6,25
2) 2²+(1/2)²=4+0,25=4,25
3) (2-1/2)³=2³-3×2²×1/2+3×2×(1/2)²-(1/2)³=8-6+1,5-0,125=3,125
4) (2+1/2)³=2³+3×2²×1/2+3×2×(1/2)²+(1/2)³=8+6+1,5+0,125=15,625
5) 2²-(1/2)²=(2-1/2)(2+1/2)=1,5×2,5=3,75
6) 2³-(1/2)³=(2-1/2)(2²+2×1/2+(1/2)²)=1,5×5,250=7,875
Число, обратное двум: 1/2 (т. к. 2×1/2=1)
1) (2+1/2)²=2²+2×2×1/2+(1/2)²=6,25
2) 2²+(1/2)²=4+0,25=4,25
3) (2-1/2)³=2³-3×2²×1/2+3×2×(1/2)²-(1/2)³=8-6+1,5-0,125=3,125
4) (2+1/2)³=2³+3×2²×1/2+3×2×(1/2)²+(1/2)³=8+6+1,5+0,125=15,625
5) 2²-(1/2)²=(2-1/2)(2+1/2)=1,5×2,5=3,75
6) 2³-(1/2)³=(2-1/2)(2²+2×1/2+(1/2)²)=1,5×5,250=7,875