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2、60 B C 60115%60 D 601 15%60X(1 15%40%1(10%5 6X 5=4 9 4 x 10 9 3 3 5 5=7 1 1 100 X 25%=1 1(4 2)4 5211 (1)8322 x-20%x=16 18 1 1 4x=4 2 7.5 536 18 183 3.328 5 8 53 5 20 5 3 2 214 410%434 5 1820%0.35?445%7 9 2832-5 30%11889210%8803384345 448604013 5 540060%1&454 20%6 ,1%20%1.30=0.3 45=3/4 24020%48 33829
3、5%40.5:31:6 512526(25/51)&16060%96 7.618.848.2:1(4:1)9.12060 3 2402010%1.100%(V)2.(X 3.60151415:14。X 4.10033%X 5.2V 6.X 7.11(V)3 8.(V)9.V 10.40%4(X)5.10%1C A 3.14 O B 1-O3 C-O-D0.7 5 O0.75 2 5 5 4 9 4 2C AB C D323B 1040 7 A 3:2 B 2:3 C 4:9 D 9:4 440004500B(10%8 54500 4500 4000 45004000 X 100%BX 100%
4、CX 100%4000 4000 60B C60115%601 15%-60 60 4500 15%A(115%(115%6060 X 40%1(10%5 6X 5=7.5 9 4 10 9 0.4 15 5 5=7 100 X 25%=25 7 1 0.25 20 5 15 16 2(10%)x-20%x=16 9 18 3 X 4 x=1/4 1 1 4x=4 2 x=20 x=0.625 1 2x x=10 2 X=1/16 X=4 34 5 4 1x x 9 6 9 6=4/9 X 1=4/912 5 3 1x +|+5 6 4 5=12/5 X 19/12+0.2=3.8+0.2=4
5、 41=1=3/10-5/18=1/45=3=3-1=2 41-4 5(4-1/4)X 3/5=2.25 10%7 5 5 3 3 3 2 _m _ x +x 36 18 18 8 5 8 5-7/10-5/18=3/8(3/5+2/5)=3/8 2 21-(5/7+2/7)3 9 18200.35?18X 20%+0.35=3.95 -445%7 9 4/9 X 45%1/7=2/35(4).28323X-2=28X=102.-5 5:2 30%811829 818X(1-=2 9210%8808801+10=800 338434596128160 448603 10 4011 11 (1-1/60+1/40=16 3 540060%4001+60%=250 400-250=150&454 20%45 X(1+20%)1/4=216()