1.

\begin{array}{l}{7+7+7+7+7=} \\ {8 \times 5=5 x} \\ {23 x-y=23} \\ {15 x-z=120} \\ {43 \times 10=}\end{array}

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a = 35 c = 40 e = 1 g = 5 i = 430

(a) 7×7×7×7×7=35 (c) 8×5=5×8(e) 23×1=23(g) 15×8=120(i) 43×10=430g



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