5 5 8 11和5 6 9 13算24
5*8-5-11=24
(13-5)*(9-6)=24
4.25÷2.5×9.9+0.17的簡便計算法
4.25÷2.5×9.9+0.17
=1.7×9.9+0.17
=1.7×9.9+0.1×1.7
=1.7×(9.9+0.1)
=1.7×10
=17
9.05-2.6 3.4怎樣簡便計算
9.05-2.6-3.4=9.05-(2.6+3.4)=9.05-6=3.05