直接写出得数4÷= 2.6﹣1.7= += 10﹣10%=1.25×0.16×8= 1÷= ÷= 0.9×0.1=
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
= 2.6﹣1.7= 
+
= 
÷
= 0.9×0.1=
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