1.83/8×7/11+7/8×5/11 2.1×2×3+7×14×21/1×3×5+7×21×35

1.83/8×7/11+7/8×5/11＝83/11×7/8+7/8×5/11＝7/8×(83/11+5/11)＝7/8×8＝72.1×2×3+7×14×21/1×3×5+7×21×35 ＝1×2×3+7×（1×2×3）/1×3×5+7×（1×3×5）＝1×2×3×(1+7)/1×3×5×(1+7)＝1×2×3/...

Formula: (121 + 122 +...) +170）-（41+42+… +98)______ (fill in odd or even numbers)

At 121 + 122 + +There are odd numbers (170 + 1-121) △ 2 = 25 in 170, so 121 + 122 + +In 41 + 42 + +There are odd numbers (98 + 1-21) △ 2 = 29 in 98, and the sum is odd

1.83/8×7/11+7/8×5/11 2.1×2×3+7×14×21/1×3×5+7×21×35

1.83/8×7/11+7/8×5/11 2.1×2×3+7×14×21/1×3×5+7×21×35

Formula: (121 + 122 +...) +170）-（41+42+… +98)______ (fill in odd or even numbers)

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