Hình chữ nhật ABCD gồm hình thang AECD và hình tam giác BCE có kích thước như hình vẽ: a,Tính diện tích hình chữ nhật ABCD; b,Tính diện tích hình thang AECD; c,Cho M là trung điểm của cạnh AD.Tính diện tích hình tam giác ECM. #Toán lớp 5 a b c d <text style="null;cursor: url(" data:image="" png;base64,ivborw0kggoaaaansuheugaaacaaaaagcayaaabzenr0aaaaaxnsr0iars4c6qaaboxjrefuwee913tsfeucb="" dv7o3ttzrsyknnc7r3hsqokiciyjcyeegqkch2dri1ejbcfgmi8ifx+yftvtq+imi0msyaikt+4a95kiaiihjdivz8bmno9q4tpcbbh3e93z356dzulrzk6jnjlreb3zvfz38z85tbfo1g1xhrngdtjlgyazq="" 4wy2fo1gu6ivoejznta609tluu7diutihxtluaanvjvnx1m9dbh1jlix3bqkqrysa="" +nqhiar0v1+mdurukci+rnodrpuw6ax03t3d3rca+wqlsvf="" omqblo9urubrjgttqsij63lgv7rcjyglphpuonaz0abkhhjqx+jynmf="" tarc9zlvxgrce8wiqpesoamr7a9razqxjqzxyco5kbin6ylgvlrcauwi4tlwnwpzejfxgc3rckujkwyucnvj3ec8bwged8nbo6nhafymyqs4z61dn9gjeb="" iciehhnbez8qqeahr2c8zoa2ffc5ab1y6yydbfpgwgunwmfiuj8="" yv8+f0p9aa7le6nv3v0dpsob8idlck2gmp9gd8hchnih6tvsdh+ni3gg10iadjmom6k1tbw82nfeiahi42gqqlebgygveoc2h0yg61fd4np+mt13wxjzlj1ligcohbxzco+smqiaabxetnowxlhhh3cwcz93zaaf0istsqsp0el8aapfbnx5umarsqgb1cy788irpumr5nujly52k3maywsmukvxvdnykjhygfcjzxistx5oineiyuu664czsbmae6zzmsxtb4mufzg9fsov0rz90ic6ibejmzxwae0gcro+ygrdichmf9oxjdm9ieg9md7qkcbocgoexmjmiyxz23yusrvlmxtgs5cafpq5xwg4osndzpoyncbnffyafer5mbzvbr98t2rjtx2uobnwzdpmiuja8wtcmuxfv4o1b="" qd37fkmjlel5se2hkszxoaymxkjuaa0bao+e8besamttdocafbynrqd="" cf3o="" 9b9eeqhrcqe2bwajivodwbki6ghqj4t4pjlmno8mcjsralwqgpyb="" h6qn3t+8ttzvmltkqfgtnmyrlehg+ha9+xmqm3sykhxnuebcdjs4wjpqqazlffsrqclivxcjaioinz3m0rk4djnfmf4adi1t+ofjxmm8ltelqysfjkvotnkggnomyepr+4kqlpzfvhi="" bpao50mrhkjzvmhx4jqgchur="" sc+0sztpywvahra9ai4f0adql46omoq6xkgj8s3s7hblntjwef53zfwagd04oycszlcgqsmyhqoed="" q07d4xbhmbi05hbqzl3lazyqqxg5peglho2klhe2tlt8ovoeky8vr9e07xuap9u2vbgtru1vtp4wiure="" x9qvly3lde="" kf+whdyhwjgkiud0ked87agb1="" thwvnzdmmwwpywuoenpc7lgiqig9jbhhr1vf0ilmw1x6+voa7nfvp1wiqs2egcrf+xnisk8ndeats7da="" zhtaytpqmqv7vrtygbqihw7n1xf8nzgitiwj3="" 313bdbbfkejvmc5f2he0efvz2g1adt6luzuttpyh3tj5bdbymahfiiginhodw2roytugjagoqiiyhg7ksfuuqmcl8dqck0fp+avrtmhanx5rfmzygkbwgyac1sriqjdnhp16qbejufv="" goiekhoazmx5qaaaabjru5erkjggg="=")" 1="" 1,="" auto="" !important;"="" class="sweezy-custom-cursor-default-hover" stroke="#000" transform="matrix(1.3501778841018677,0,0,1,-44.4690326494856,0) " xml:space="preserve" text-anchor="start" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_10" y="203.25" x="107" stroke-width="0" fill="#000000">m e 12cm 18cm 30cm