4 x + 2 y = 754 (1) x + y = 200 (2)Question solving process: Divide the two sides of equation (1) by 4, the equation can be obtained: x + 1 2 y = 377 2 (3), then subtract both sides of equation (3) from both sides of equation (2), the equations are reduced to:...
解答:4x2y-5x3y2+7xy3-中,次数最高的项是-5x3y2,其次数是3+2=5,∴该多项式是5次4项式,所以4x2y-5x3y2+7xy3-是5次4项式,最高次项式-5x3y2.点评:本题考查了多项式的次数和项数的概念,注意多项式的次数是“多项式中次数最高的项的次数”. ...
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(1)x+y+z=6 ①3x-y+2z=12② x-y-3z=-4 ③①+②4x+3z=18 ④②-③2x+5z=16⑤⑤×2 4x+10z=32⑥ ⑥-④7z=14 解得z=2 代入⑤2x+5×2=16解得x=3将x=3 z=2 代入①3+y+2=6解得y=1x=3 y=1 z=2(2)x+y-z=2① 4x-2y+3z+8=0 ②... 解析看不懂?免费查看...
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38waSqMU2Awk2ydfAxw4M6SH2G6GRoy31Y 0.0040712BTC 3Nd1FxqXAXXzyA6u41xgehqhzS61VyFVSY 0.01709786BTC 3FczAn26k5zQmymS7vhgnfzpU8q2eSsAwE 0.00121888BTC 1578RDjg15RQm3GYdRvdNymYh3epNqjAA8 0.00239849BTC 3L6VW43Ei37X2rWQTMeCK2WCmfmMDTT2dQ 0.00248535BTC 151Sx7UPrjAFbhWiPorxA469S4X2Gqu9dF ...
解答解:⎧⎪⎨⎪⎩3x−4y+5z=3①2x−2y+3z=4②4x+y−2z=2③{3x−4y+5z=3①2x−2y+3z=4②4x+y−2z=2③, ③×2+②得:10x-z=8④, ③×4+①得:19x-3z=11⑤, ④×3-⑤得:x=13111311, 把x=13111311代入④得:z=42114211, ...
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