简便计算: (1) (2) (3) (4) 答案:解:原式 =(−12)+(−512)+314+234 =−6+6 =0
解:原式 =79×(−36)−56×(−36)+34×(−36) =−28−(−30)+(−27) =−28+30−27 =−25
解:原式 =(−5+0.02)×5 =−5×5+0.02×5 =−25+0.1 =−24.9
解:原式 =25×34+25×12+25×(−14) =25×(34+12−14) =25David was so excited at the good news that he could _______ say a wod.A. nearly B. hard C. ever D. hardly