问题
解答题
0.7×1
|
答案
0.7×1
+24 9
×l5+0.7×3 4
+5 9
×l5,1 4
=(0.7×1
+0.7×4 9
)+(25 9
×15+3 4
×15),1 4
=(1
+4 9
)×0.7+(25 9
+3 4
)×15,1 4
=2×0.7+3×15,
=1.4+45,
=46.4.
0.7×1
|
0.7×1
+24 9
×l5+0.7×3 4
+5 9
×l5,1 4
=(0.7×1
+0.7×4 9
)+(25 9
×15+3 4
×15),1 4
=(1
+4 9
)×0.7+(25 9
+3 4
)×15,1 4
=2×0.7+3×15,
=1.4+45,
=46.4.