①3.45×102
②0.47×0.5×0.8
③3.2+0.8×1.6
④7.2×1.25
⑤0.46×0.9+0.64×0.9
⑥1.25×（10+0.8）
0.25×3.7×40 7.86×99＋7.86
①2.8×3.6+1.4×2.8
②4.75×101
③3.17×1.2＋1.83
④4.95-14.82÷7.6
⑤12.5×16×2.5
①2×0.7×1.5
②0.81×10×0.1
③5×0.2×1.3
④3.1×3×0.4
①0.8×62.3×12.5 ②99×7.4＋7.4 ③0.64×45＋3.6×4.5
50.3+2.7×0.2 3.9×5.2+3.9×4.8
21.23-4.1×0.6-6.54 12.5×7.5×0.4×0.8
[10-(5.3+3.9)]×8.5 0.57x 99
0.125×32
3.87×6.35＋3.87×3.65