①10.9﹣150÷50×3
②520+[13×(24.5﹣20.5)]
③★3.9+4.08+5.92+1.1
④★99×17
⑤★810÷18
①76.15−9.7+11.3
②78×4×2×125
③25×404
④[(1200-900)÷50×2]×24
⑤4.9×69+4.9×32−4.9
⑥32000÷125
①2.4×1.3+3.9
②3.8-0.34-0.66
③0.89×4.6+0.89×5.4
④1.25×32×2.5