问题 计算题
脱式计算。(能简算的要简算)
(1)66.86-8.66-1.34(2)0.25×16.2×4
(3)7.09×10.8-0.8×7.09(4)(74-3.6)÷2.5÷4
    
答案
(1)66.86-8.66-1.34
  =58.2-1.34
  =56.86(2)0.25×16.2×4
  =4.05×4
  =16.2
(3)7.09×10.8-0.8×7.09
  =76.57-5.67
  =70.9(4)(74-3.6)÷2.5÷4
  =70.4÷2.5÷4
  =28.16÷4
  =7.04
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