计算题训练 一、简便计算7+ 5 ( )24 18( + )23162454956 + -( - ) 578127451033 1252570914 + 0.648)67(8431843527.82.5780.75 32251.253)1254(二、计算(能简便的要用简便运算) - + 2148214821481 1( + ) ( )23232136 8 + 0.618)725(65245+ ( + ))1437(28123415 8 + 9 6+21535419314234234123923141526651427(8521(25139543( ) 153421)837(4179812( )(5.41(81432 843 25 286410752765398 74 431 4 ( ) 215316583 2 1873149715687213573 4( ) ( )2 1235641262131 3( ) ( + )583522152183 8 + 2.61)8725(6532534 48 + 218347163527215( - ) 15 ( + )73185210521