Đề thi học kì 2 lớp 7 môn Toán năm 2017-2018 - Phòng GD&ĐT Vĩnh Yên

PHoNG-<br /> <br /> oB ruBu rRA HQC xi'u xAiu HQC<br /> iwOx' roAx z<br /> <br /> cD&PrJiNn YBx<br /> <br /> oB<br /> <br /> cnixn rrrtlc<br /> <br /> Thdi gian ldm bdi 90 phtit, kh6ng k€ thdi gian giao<br /> <br /> r. TRAC NGHTpM (3,0 tli6m)<br /> Ghi vdo til nm'cht mQi chir cdi A, B, C hofic D trwdc phwong<br /> C6u 1. Eon thric ndo sau ddy d6ng dang v6i don thuc -3xy2 ?<br /> C. -3(*Y)'<br /> B. (-3*y)y<br /> A. -3x2y<br /> Ciu 2,Gi6 tIi bi6u thric 3*'y + 3y'x tqi x = -2 vd ! = -L ld:<br /> 'A.<br /> C. 18<br /> B. -9<br /> 12<br /> CAu 3. Thu ggn don thric P = x3 ! - 5*y' + 2x'y + 5xy' bingl,<br /> C. *'Y+l}xY3<br /> B. -x'y<br /> A,.3x3y<br /> Cdu 4.56 ndo sau d6y<br /> <br /> ;.?3<br /> !^)*<br /> <br /> 6.-1<br /> 2<br /> <br /> 1<br /> <br /> =<br /> <br /> AB<br /> <br /> li<br /> <br /> di<br /> <br /> bi ilfing'<br /> <br /> dn ffrt<br /> <br /> D.-3xy<br /> D. -1&<br /> <br /> D. 3x3 y -10xy3<br /> <br /> li nghiQm ctr,dathfic f(x)=?*+t?<br /> 3<br /> B.<br /> "'2<br /> <br /> Cau S. N6u AM<br /> <br /> 20L7 - 2018<br /> <br /> ducrng trung tuy6n<br /> <br /> vi G li<br /> <br /> i. oi=?o*<br /> <br /> C6u 6. Cho mQt tam giitccan c6<br /> <br /> dO dei<br /> <br /> 3<br /> <br /> trgng tdrn cria tam gi6c ABC thi:<br /> <br /> hai cqnh<br /> <br /> B' 27 cm<br /> A. 39cm<br /> rr. TIJ L,UA\ (7,0 tli6m)<br /> CiuT (1,5 ili6m)<br /> Di6m th i dua trong cic thingcira<br /> <br /> D.-?<br /> <br /> c. AG<br /> <br /> =1o,<br /> <br /> li<br /> <br /> vi<br /> <br /> 3cm<br /> <br /> C'<br /> <br /> D' AM - AG<br /> <br /> 21cm. Chu vi ctta tam gi6c d6 bdng:<br /> D' 46cm<br /> <br /> 45cm<br /> <br /> llong b6ng<br /> <br /> mQt<br /> <br /> 1<br /> t2<br /> 11<br /> 10<br /> Th6ne 9<br /> 80<br /> 80<br /> 70<br /> 90<br /> Di6m 80<br /> a) DAu t iQu ta git<br /> bi L3p bing tAi s6. rim 19t cfia d6u hiQu;<br /> c) Tinh dirSm trung binh thi dua ctra lop 7 ACffu 8 (1,5 tli6m)<br /> <br /> 2<br /> 90<br /> <br /> 4<br /> 70<br /> <br /> J<br /> <br /> 80<br /> <br /> sau:<br /> <br /> 5<br /> <br /> 80<br /> <br /> ChohaidathricP(,)=5x3_3x+7_xvitQ@)=_5x3+2x_3+2x_x2_2.<br /> a) Thu gen hai da thric P(x) vd Q@);<br /> b) Tim da thirc M (x)= P(x) + Q@) vd<br /> <br /> c) Tim nghiQm cira da thttc<br /> <br /> M(x).-<br /> <br /> N(x)<br /> <br /> - P(x) - t'Q@);<br /> <br /> cffu 9 (3,0 tli6m). Cho MBC co AB =3cmi AC = 4cm; BC = 5cm.<br /> a) Chtmg t6 tam gi6c ABC vu6ng tqi A '<br /> DA - DE;<br /> b) Vc ph6n gi6c BO(p. AC), tt D vd, DE L BC (A e aC). Chtmg minh:<br /> c\/o ED cht ,qn @i F. Chtrngminh: DF > DE'<br /> Ciu 10 (1,0 tli6m). Cho a,b,c ln cac tO tftUt kh6c 0. Tim c6c s6 thqc x,y,z l