989. Вычислите удобным способом:
1) 18,52 - 18 × 37 - 18 × 13;
3) 21 × 74 + 21 · 11 - 85 · 10;
2) 42 × 31 - 38 × 42 + 21 × 16;
4) -128 · 39 + 78. 32 + 64. 59.


Дам 20 баллов❤​
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