(1)计算:50°24′×3-98°12′25″;(2)计算:30÷(15?16)+(?1)2011÷110×10;(3)计算:(-2)3+
(1)计算:50°24′×3-98°12′25″;(2)计算:30÷(15?16)+(?1)2011÷110×10;(3)计算:(-2)3+(-3)×[(-4)2+2]-...
(1)计算:50°24′×3-98°12′25″;(2)计算:30÷(15?16)+(?1)2011÷110×10;(3)计算:(-2)3+(-3)×[(-4)2+2]-(-3)2÷(-2)(4)计算:1-2(1-2x+x2)+3(-x2+x-1);(5)解方程:2(x-2)-3(4x-1)=5(1-x)(6)解方程3x+52=2x?13-1
展开
1个回答
展开全部
(1)50°24′×3-98°12′25″,
=150°72′-98°12′25″,
=151°12″-98°12′25″,
=52°59′35″;
(2)30÷(
?
)+(?1)2011÷
×10,
=30÷(
-
)-1÷
×10,
=30÷
-1÷
×10,
=900-100,
=800;
(3)(-2)3+(-3)×[(-4)2+2]-(-3)2÷(-2),
=(-2)3+(-3)×18-(-3)2÷(-2),
=-8+(-3)×18-9÷(-2),
=-8-54+
,
=-57
;
(4)1-2(1-2x+x2)+3(-x2+x-1),
=1-2+4x-2x2-3x2+3x-3,
=-5x2+7x-4;
(5)2(x-2)-3(4x-1)=5(1-x),
去括号,得
2x-4-12x+3=5-5x,
移项,合并同类项,得
-5x=6,
系数化为1,得
x=-
.
(6)
=
-1,
去分母,得
3(3x+5)=2(2x-1)-6,
去括号,得
9x+15=4x-2-6,
移项,合并同类项,得
5x=-23,
系数化为1,得
x=-
.
=150°72′-98°12′25″,
=151°12″-98°12′25″,
=52°59′35″;
(2)30÷(
1 |
5 |
1 |
6 |
1 |
10 |
=30÷(
1 |
5 |
1 |
6 |
1 |
10 |
=30÷
1 |
30 |
1 |
10 |
=900-100,
=800;
(3)(-2)3+(-3)×[(-4)2+2]-(-3)2÷(-2),
=(-2)3+(-3)×18-(-3)2÷(-2),
=-8+(-3)×18-9÷(-2),
=-8-54+
9 |
2 |
=-57
1 |
2 |
(4)1-2(1-2x+x2)+3(-x2+x-1),
=1-2+4x-2x2-3x2+3x-3,
=-5x2+7x-4;
(5)2(x-2)-3(4x-1)=5(1-x),
去括号,得
2x-4-12x+3=5-5x,
移项,合并同类项,得
-5x=6,
系数化为1,得
x=-
6 |
5 |
(6)
3x+5 |
2 |
2x?1 |
3 |
去分母,得
3(3x+5)=2(2x-1)-6,
去括号,得
9x+15=4x-2-6,
移项,合并同类项,得
5x=-23,
系数化为1,得
x=-
23 |
5 |
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询