19 × (12 + 18) = (19 × 12) + (19 × ___) [1)
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Answer:
19×(12+18)=(19×12)+(19×_)
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19×(12+18) = (19×12)+(19×_)a
19×(30) = (228) + (19+y)
570 = 228+19y
570-228 = 19y
342 = 19y
342÷19 = y
18 = y
means y = 18
so
19×(12+18) = (19×12) +(19×18)
19×30 = 228 + 342
570 = 570
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