解:X+2y=12①,5X+3y=39② 5×①-②得:10y-3y=5×12-39 解得:y=3,把y=3代入①式中得:X+2×3=12 解得:X=6 所以X=6,y=3 此题也可用代入法求解,由①得X=12-2y,代入②式中,求岀y,再求X
04:12 因式分解:(x²+x+1)(x²+x+2)-12,很多学生急哭了,擦破卷子也没算出答案。 03:22 解方程:x³=15x+4,题目简洁,但会的人不多! 03:28 解方程:(1+x²)²=4x(1-x²),错误率高达90%,这是什么情况? 04:05 因式分解:x²-y²+5x+3y+4,看了好久也找不到解题思路,好...
master .github bake build cmd commands driver hack store util vendor version .dockerignore .gitignore .mailmap .travis.yml AUTHORS Dockerfile LICENSE MAINTAINERS Makefile README.md go.mod go.sum gometalinter.json Latest commit Cannot retrieve latest commit at this time. ...
解:380是偶数,所以5x和2y要么同为奇数,要么同为偶数。因为2是偶数,2y的乘积必然是偶数。所以5x也必须是偶数,且因为5是奇数,要使乘积5x是偶数,x必须是偶数。得:因条件有限,故只能得出x是偶数。需要补充条件才能解x和y的数。
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dists/trusty/main/installer-amd64/20101020ubuntu318/images/netboot/ubuntu-installer/amd64/boot-screens/vesamenu.c32 d2xx7gh5Y4Ecs1tDjNRppw=Debian:dists/trusty/main/installer-amd64/20101020ubuntu318/images/netboot/ubuntu-installer/amd64/pxelinux.0 ODBVPk0uHgQCOKQxeRHY7Q=Debian:dists/trusty/...
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3.平方差公式:(a+b)(a-b)=a^2-b^2. (1)(x+2)(x+3) =x^2+3x+2x+6 =x^2+5x+6 (2)(x-4)(x+1) =x^2+x-4x-4 =x^2-3x-4 (3)(x-3)(2x+7) =2x^2+7x-6x-21 =2x^2+x-21 (4)((3x+1))^2 =9x^2+6x+1 (5)((5x-2y))^2 =25x^2-20xy...
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