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式の計算の利用で求め方を教えて欲しいです😿

1.7X3.09 4.9x1.03 +1.7

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=1.7×3×1.03+4.9×1.03+1.7
=5.1×1.03+4.9×1.03+1.7
=1.03(5.1+4.9)+1.7
=1.03×10+1.7
=10.3+1.7
=12

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