99×0.9999 0.98×9.89.8 3.6×0.230.23
0.2×8= 12.5×8= 6.2+0.04= 2.5×0.4=
0.6×0.7= 6-0.7= 6.4+4.6= 0.04×0.3=
0.5×2.4= 5.18+3.02= 0.2×2.5= 1.41×1000=
①9.2+5.8×2.3
②100-21×4.5
③1.25×8.8
④0.8×3.9×1.25
⑤4.87×2.4+4.87×7.6
⑥60.8-7.18-12.82
三角形;平行四边形。