41 and 1 / 3 × 4 / 9 + 51 and 1 / 4 × 4 / 5 + 61 and / 5 × 5 / 6 kneel down to find the formula and answer of this problem. We must use simple calculation!

41 1 / 3 × 3 / 4 + 51 1 / 4 × 4 / 5 + 61 / 5 × 5 / 6
=（40+4／3）×3/4＋（50+5／4）×4／5＋（60+6／5）×5／6
= 30+1+40+1+50+1
=123

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