横线里最大能填几? ×60<414 32× <210 ×63<243 53× <450 ×80<353 28× <180 ×57<720 ×25<210.
98+4×980+59×98.
用简便方法计算 87×2.5+8.7×756.84×10.19.05﹣3.86﹣3.14.
667×668×669﹣666×668×670= .
12.5×3.2×2556.8×0.17+1.7×4.02+0.03×17 9.76﹣2.084+0.24﹣0.9169999×2222+3333×3334.
简算. 87﹣2.123﹣0.87726.3×78+2.63×22025×5+74×5+5 444×25