直接写出得数.6.2×0.1= 0.25×4= 0.9×0.7=8×0.4+8×2.6= 0.05×0.7= 0.68+0.02=2.3×0.3= 6×0.8×0.125= 1.3﹣0.03=16×0.25= 0.24×0.5= 0.4×0.7×2.5=
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