问题
解答题
计算: (1)(-36)×(
(2)4.7×3.6+5.4×
(3)(-5)3×
(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)+
×(5.4+4.6)1 2
=36+5
=41;
(3)原式=-125×
-125×3 4
+125×1 4 1 2
=125×(-
)1 2
=-62
;1 2
(4)原式=2x2-5xy-3x2+3y2+x2-3y2-4xy-2
=-9xy-2.