(1)计算:2×68-43+27×8(2)计算:(1+3)(2-6)-(23-1)2(3)解方程组:2x+3y=03x-y=11(4)解方程组:2(x+y)-3(x-y)=34(x+y)+3x=15+3y.-数学

题文

(1)计算:

2
×

6

8
-

4
3
+

27
×

8
    
(2)计算:(1+

3
)(

2
-

6
)-(2

3
-1)2
(3)解方程组:

2x+3y=0
3x-y=11
               
(4)解方程组:

2(x+y)-3(x-y)=3
4(x+y)+3x=15+3y
题型:解答题  难度:中档

答案

(1)原式=

2
×

6
2

2
-
2

3
3
+3

3
×2

2

=

6
2
-
2

3
3
+6

6

=