1第二章 有理数及其运算 计算能力提升训练题二二、有理数减法运算:1. 79 2. 79 3. 0(9) 4. (25)(13) 5. 8.2(6.3)6. (3 )5 7. (12.5)(7.5) 2148. (26)(12)1218 9. 1( )(+ ) 21310. (20)(+5)(5)(12) 11. (23)(59)(3.5) 12. |32|(12)72(5)13.( )( ) 4185114. (+ )( )( ) 103745271015.( )3(3.2)7 16. (+ )( ) 516 71723217.(+6.1)(4.3)(2.1)5.1 18.( )(1 )(1 )(+1.75)32433219.(3 )(2) (1 )(1.75) 2433220. 8 5 4 3 397619221.4 + +( ) 36132522. 0.5+( )(2.75)+ 412123.(+4.3)(4)+(2.3)(+4) 24. (0.5)(3 )6.7554121