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.

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