问题 解答题
计算:
(1)(-36)×(
5
4
-
5
6
-
7
12
)

(2)4.7×3.6+5.4×
1
2
+5.3×3.6+4.6×
1
2

(3)(-5)3×
3
4
-53×(-
1
2
)2-(-5)2×(-
5
2
)

(4)(2x2-5xy)-3(x2-y2)+x2-3y2-2(2xy+1)
答案

(1)原式=-45+30+21

=6;

(2)原式=3.6×(4.7+5.3)+

1
2
×(5.4+4.6)

=36+5

=41;

(3)原式=-125×

3
4
-125×
1
4
+125×
1
2

=125×(-

1
2

=-62

1
2

(4)原式=2x2-5xy-3x2+3y2+x2-3y2-4xy-2

=-9xy-2.

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