помагити Вариант 5. 20. выполни указанные действия: 1. 1)62, 999 + 10, 139 + 6, 982 - 57 - 0, 12 - 2, 9. 2 17 - 8, 417 + 3, 51 + 19, 907 4, 55 7, 25. 3) 1, 53 + 5, 93 + 8, 2 + 4, 34 - (10 - 8, 061) 2, 239. 4)59, 881 + 6, 898 - (3, 037 - 0, 178 + 16, 92 + 17) - 9, 6. 5)14, 09 + 4, 91 - (3, 29 - 0, 661) + (16 - 9, 771 - 2, 1). 6)22, 766 + (3, 7 + 3) - (9, 52 - 3, 52 - 0, 473 + 3, 339). 7) (11, 953 + 3, 85) + 8, 028 - (1, 331 - 0, 5) - (8 - 5, 7). 8) (18 - (3, 314 + 4, 464) + 67, 1 - 64, 322 - 1, 6) + 9, 4.​

С названием формул не могу(

1.

Ar(Cu²O) = 64x2 + 16 = 144

Mr(Cu) = 128/144 = 0.89(89%)

Mr(O) = 1 - 0.89 = 0.11 (11%)

2.

Ar(Na³PO⁴) = 23x3 + 31 + 16x4 = 164

Mr(Na) = 69/164 = 0.42(42%)

Mr(P) = 31/164 = 0.19(19%)

Mr(O) = 1 - 0.42 - 0.19 = 0.39(39%)

3.

Ar(AlCl³) = 27 + 35.5x3 = 133.5(134)

Mr(Al) = 27/134 = 0.2(20%)

Mr(Cl) = 1 - 0.2 = 0.8(80%)

4.

Ar(Ba³N²) = 137x2 + 14x2 = 302

Mr(Ba) = 274/302 = 0.9(90%)

Mr(N) = 1 - 0.9 = 0.1(10%)

5.

Ar(KNO³) = 39 + 14 + 16x3 = 101

Mr(K) = 39/101 = 0.39(39%)

Mr(N) = 14/101 = 0.14(14%)

Mr(O) = 1 - 0.39 - 0.14 = 0.47(47%)

6.

Ar(Fe(OH)²) = 56 + 2(16 + 1) = 90

Mr(Fe) = 56/90 = 0.62(62%)

Mr(O) = 32/90 = 0.36(36%)

Mr(H) = 1 - 0.62 - 0.36 = 0.02(2%)

7.

Ar(Mg(NO³)²) = 24 + 2(14 + 16x3) = 148

Mr(Mg) = 24/148 = 0.16(16%)

Mr(N) = 28/148 = 0.19(19%)

Mr(O) = 1 - 0.16 - 0.19 = 0.65(65%)

8.

Ar(Al²(SO⁴)³) = 27x2 + 3(32 + 16x4) = 342

Mr(Al) = 54/342 = 0.16(16%)

Mr(S) = 96/342 = 0.28(28%)

Mr(O) = 1 - 0.16 - 0.28 = 0.56(56%)