题目

脱式计算。(能简算的要简算) (1) 35×40+630÷18 (2) 36.5×25%+0.25×65.5-2× (3) 7.2×1.25 (4) 答案: 35×40+630÷18 =1400+35 =1435 36.5×25%+0.25×65.5-2×14 =36.5×25%+25%×65.5-2×25% =(36.5+65.5-2)×25% =100×25% =25 7.2×1.25 =9×0.8×1.25 =9×(0.8×1.25) =9×1 =9 16+112+120+130+142 =12-13+13-14+14-15+15-16+16-17 =12-17 =514
数学 试题推荐