问题
解答题
(1)计算:-14-2
(2)化简:(3a2-ab+7)-2(ab-2a2+1) |
答案
(1)-14-2
+41 3
÷(-3)÷(-1 5
)3 5
=-1-2
+1 3
×(-21 5
)×(-1 3
)5 3
=-1-2
+1 3 7 3
=-1;
(2)(3a2-ab+7)-2(ab-2a2+1)
=3a2-ab+7-2ab+4a2-2
=7a2-3ab+5.
(1)计算:-14-2
(2)化简:(3a2-ab+7)-2(ab-2a2+1) |
(1)-14-2
+41 3
÷(-3)÷(-1 5
)3 5
=-1-2
+1 3
×(-21 5
)×(-1 3
)5 3
=-1-2
+1 3 7 3
=-1;
(2)(3a2-ab+7)-2(ab-2a2+1)
=3a2-ab+7-2ab+4a2-2
=7a2-3ab+5.