2.5×(1.9+1.9+1.9+1.9) 160×3.5×0.125
24×+72÷5+14×20% 18×4.3+36×2.05+×32
3.8×99+3.8 2.8+4.36+5.64 [×(-)]÷
25×125%×32 3.5×+5.5×80%+0.8 ×[60%-(-40%)]
①0.25×16.2×4
②375+450÷18×25
③35.6- +34.4-
④ × + ÷
⑤[( - )× ]÷
⑥3.5× +5.5×80%+0.8