3. If 20 cases of apples are transported by each truck, how many times will the remaining 1080 cases of apples be transported by 3 trucks? (480 cases of apples are transported by 3 trucks in total) will be listed as a comprehensive formula (similar to the off formula calculation)
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- 17. Z = (1 + x ^ 2 + y ^ 2), then DZ (1,1) is equal to (DX + dy) Such as the title Missed a sign. It should be Z = (1 + x ^ 2 + y ^ 2) open root, then DZ (1,1) is equal to (DX + dy)
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