①714÷21+24×5
②0.25×3.2×1.25
③(0.52×2.4)÷(0.8×2.6)
④÷7+×
⑤17×11×(+)
⑥解比例:=x:25
①
②1.25×1.3×80
③7.28-3.14+1.72-2.86
④
⑤
⑥
②
③12.5×0.32×2.5
④5÷+÷5
⑤18×()×14
⑥4.5×26+45×7.4