用简便算法解答2道数学题12.7*3.1-1.277.98*1.7+79.8*0.33

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用简便算法解答2道数学题12.7*3.1-1.277.98*1.7+79.8*0.33用简便算法解答2道数学题12.7*3.1-1.277.98*1.7+79.8*0.33用简便算法解答2道数学题12

用简便算法解答2道数学题12.7*3.1-1.277.98*1.7+79.8*0.33
用简便算法解答2道数学题
12.7*3.1-1.27
7.98*1.7+79.8*0.33

用简便算法解答2道数学题12.7*3.1-1.277.98*1.7+79.8*0.33
1,=12.7(3+0.1)-1.27
=38.1+1.27-1.27
=38.1
2,=7.98*(1.7+3.3)
=7.98*5
=39.9

(1)=1.27*31*-1.27
=1.27(31-1)
=38.1
(2)=7.98*1.7+7.98*3.3
=7.98(1.7+3.3)
=7.98*5
=39.9