Mathematics
Junior High
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(2)と(3)が分かりません💦途中式も含めて教えてください🙇‍♀️🙏

3 次の計算をしなさい。 (1) 0.43.c-0.78+0.32.c-0.28 = (0.43+0.32) x +(-0.78-0.28) - 0.75x-1.06 5-4に42+ 5 a) 20 1 11 (3) -号-+号+6-) 6 a a 7 4

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