问题
解答题
|
答案
(1)586×124+29×586-586×53,
=(124+29-53)×586,
=100×586,
=58600;
(2)21×(
+3 7
+1 3
+4 21
),5 14
=21×
+21×3 7
+21×1 3
+21×4 21
,5 14
=9+7+4+10,
=16+4+10,
=30;
(3)28×5+2×4×35+21×20+14×40+8×62,
=28×5+2×4×7×5+3×7×4×5+14×2×20+8×62,
=28×5+28×10+28×15+28×20+8×62,
=28×(5+10+15+20)+8×62,
=28×50+8×62,
=1400+496,
=1896;
(4)5
+11 2
+33 5
+23 8
+61 6
+42 5
+1 3
,5 8
=(5
+41 2
)+(11 3
+63 5
)+(32 5
+3 8
),5 8
=9
+8+4,5 6
=21
.5 6