问题
解答题
计算: (1)-32×1.22÷0.32+(-
(2)3x2y-2[x2y-(xy-
|
答案
(1)原式=-9×
×36 25
+100 9
×(-27)÷(-1)1 9
=-144+3
=-141;
(2)原式=3x2y-2(x2y-xy+
x2-2x2)1 4
=3x2y-2x2y+2xy-
x2+4x21 2
=x2y+2xy+
x2.7 2
计算: (1)-32×1.22÷0.32+(-
(2)3x2y-2[x2y-(xy-
|
(1)原式=-9×
×36 25
+100 9
×(-27)÷(-1)1 9
=-144+3
=-141;
(2)原式=3x2y-2(x2y-xy+
x2-2x2)1 4
=3x2y-2x2y+2xy-
x2+4x21 2
=x2y+2xy+
x2.7 2