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青岛版备战2020年小升初数学专题二:图形与几何-图形的认识及计算

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2=2512 41\r50-1&S 8%ab'23+25.12 41.\r51-1&EIc'^2./de>_205 1 W !223_20'20 = 400 451.\r, -15-15-20=50g1\r15*20*20=55®*\r501 1 55h1\r52-1 > 7 -8%&\'./ij+5051.\rk :^1=1800-909-50°=40°\r53-1&z2=1800-55o-400=85*\r54-1&l -mn&\-opqpr&&\-stuv  & \ -wuxpy"&\-p q ;y{&\-p® ®\r 1 7 | ` 1 8 |.\r}_/3=210'-180= 30p zl=210'-180o=30°; z2=180, -30,=150\\r55-1S  zl=30*, z2=15O*, z3=3O\\r, :8+2=4 ( cm ) 6+2=3 ( cm )\r344X(42-32)\r=3.14x(16-9)\r=3.14x7\r=21.98 ( cm2 )\r56-1 -€WS(fl9^W21.98cm2.\r, 9+L5=6(m )\r9x6=54 ( cm2 )\r57-1 -8%‚ƒ'„:…†+54 41.\r, -( 9xL2*6xL2 ) ,2+54=90 ( m2 )\r57-27 -‡ˆ‰'23+90 41.\r, :3.14x (4 + 2 )2xl.5xjx740\r=3.14,4,0.5(740\r=3.14x1480\r=4647.2 ( Š‹)\r58-17 -8MCŽ1 6 4 7 2 ‹.\rZ 1 8 [ 0 1 8 [

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