Question

помогите пожалуйста
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Answer 1

a)

64 + 8 + 26 = 90 + 8 = 98

(32 + 15) + 25 = 32 + 15 + 25 = 32 + 40 = 72

б)

$a \times 2 = 2 \times a \\ 2 \times a = 2 \times a$

$200 \times 4 < 4 \times 300 \\ 800 < 1200$

$7 \times 2 + 7 < 7 \times 4 \\ 14 + 7 < 28 \\ 21 < 28$

$b \times 3 - b = b \times 2 \\b \times (3 - 1) = b \times 2 \\ b \times 2 = b \times 2$