问题
解答题
用简便方法计算
1.25×17×8
8.3×2.6-8.3×1.6
7.8+0.56+2.2
341+127+59+173
1300÷25÷4
156×l0l-156.
答案
(1)1.25×17×8
=1.25×8×17
=10×17
=170;
(2)8.3×2.6-8.3×1.6
=8.3×(2.6-1.6)
=8.3×1
=8.3;
(3)7.8+0.56+2.2
=7.8+2.2+0.56
=10+0.56
=10.56;
(4)341+127+59+173
=341+59+(127+173)
=400+300
=700;
(5)1300÷25÷4
=1300÷(25×4)
=1300÷100
=13;
(6)156×l0l-156
=156×(101-1)
=156×100
=15600.