问题
解答题
脱式计算,能简算的要简便.
0.25×9.87×4
0.73×101
97.8×9.9+97.8
76.3×27-76.3×17.
答案
(1)0.25×9.87×4
=0.25×4×9.87,
=1×9.87,
=9.87;
(2)0.73×101
=0.73×(100+1),
=0.73×100+0.73×1,
=73+0.73,
=73.73;
(3)97.8×9.9+97.8
=97.8×9.9+97.8×1,
=97.8×(9.9+1),
=97.8×10.9,
=1066.02;
(4)76.3×27-76.3×17
=76.3×(27-17),
=76.3×10,
=763.