问题
解答题
(1)计算-9÷3+(
(2)计算3a3b2÷a2+b•(a2b-3ab-5a2b) |
答案
(1)-9÷3+(
-1 2
)×12+32,2 3
=-3+(-
)×12+9,1 6
=-3-2+9,
=4;
(2)3a3b2÷a2+b•(a2b-3ab-5a2b),
=3ab2+b(-3ab-4a2b),
=3ab2-3ab2-4a2b2,
=-4a2b2.
(1)计算-9÷3+(
(2)计算3a3b2÷a2+b•(a2b-3ab-5a2b) |
(1)-9÷3+(
-1 2
)×12+32,2 3
=-3+(-
)×12+9,1 6
=-3-2+9,
=4;
(2)3a3b2÷a2+b•(a2b-3ab-5a2b),
=3ab2+b(-3ab-4a2b),
=3ab2-3ab2-4a2b2,
=-4a2b2.