递等式计算(能巧算则巧算): (1) 49×125×8
(2)5980-5750-50
(3)9572-6235+1428
(4) 560-236+440-164
(5) 1000-287+513
(6) 399×3
(7) 853+479-121
(8) 88×9÷8
(9) 129+255+71+345
(10) 25+72×3
(11) 346+178-78
(12) 25+25+25+25
(13) 174×4÷7
(14) 32×125×8
(15) 472+239+661
(16) 8×325+163×2
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