A + B = C
∴18 + 17
= (20 - 2)+(20 - 3)
= 20 - 2 + 20 - 3
= (20 + 20)+(-2 - 3)
= 40 - 5
= 35
答:18+17等于35
解:18+17等于( 35 )∵已知需求出18+17等于多少
X + Y = Z
∴18 + 17
= (20 - 2)+(20 - 3)
= 20 - 2 + 20 - 3
= (20 + 20)+(-2 - 3)
= 40 - 5
= 35
答:18+17等于35
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