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数学Ⅰ试题参考公式:锥体的体积公式:V锥体=31Sh,其中S是锥体的底面面积,h是高.一、填空题:本大题共14小题,每小题5分,共计70分.1·设集合A={-1,1,3},B={a+2,a2+4},A∩B={3},则实数a的值为.2·设复数z满足z(2-3i)=6+4i(i为虚数单位),则z的模为.3·盒子里共有大小相同的3只白球
Mathematical I test reference formula: cone volume formula: V cone = 31Sh, where S is the bottom surface area of the cone, h is high .Fill the blank question: The big problem a total of 14 small problems, each small problem 5 points, A total of 70 points 1. Set the set A = {- 1,1,3}, B = {a + 2, a2 + 4}, A∩B = {3} z satisfies z (2-3i) = 6 + 4i (i is an imaginary unit), then z modulo is 3. · There are 3 white balls of the same size in the box