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菜题几个-DS
What is the volume of a certain rectangular solid?
1 two adjacent faces of the solid have areas 15 and 24
2 each of two opposite faces of the solid has area 40
in a certain 2-digit integer, the ratio of the units digit to the tens digit is 2 to 3, what is the integer?
1. the tens digit is 3 more than the units digit
2. the product of the two digits is 54
is x negative?
1. n3(1-x2)<0 (n3,x2都是乘方,我不会打)
2. x2-1<0 |
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