问题
解答题
计算 (1)-24÷(-
(2)(-2)2+[18-(-3)×2]÷2. (3)x2+2x+3(x2-
|
答案
(1)原式=-16×(-7)×(-7)=784;
(2)原式=4+(18+6)÷2=4+12=16;
(3)原式=x2+2x+3x2-2x=4x2.
计算 (1)-24÷(-
(2)(-2)2+[18-(-3)×2]÷2. (3)x2+2x+3(x2-
|
(1)原式=-16×(-7)×(-7)=784;
(2)原式=4+(18+6)÷2=4+12=16;
(3)原式=x2+2x+3x2-2x=4x2.