题目内容
计算:
(1)(-36)×(
-
-
)
(2)4.7×3.6+5.4×
+5.3×3.6+4.6×
(3)(-5)3×
-53×(-
)2-(-5)2×(-
).
(4)(2x2-5xy)-3(x2-y2)+x2-3y2-2(2xy+1)
(1)(-36)×(
| 5 |
| 4 |
| 5 |
| 6 |
| 7 |
| 12 |
(2)4.7×3.6+5.4×
| 1 |
| 2 |
| 1 |
| 2 |
(3)(-5)3×
| 3 |
| 4 |
| 1 |
| 2 |
| 5 |
| 2 |
(4)(2x2-5xy)-3(x2-y2)+x2-3y2-2(2xy+1)
(1)原式=-45+30+21
=6;
(2)原式=3.6×(4.7+5.3)+
×(5.4+4.6)
=36+5
=41;
(3)原式=-125×
-125×
+125×
=125×(-
)
=-62
;
(4)原式=2x2-5xy-3x2+3y2+x2-3y2-4xy-2
=-9xy-2.
=6;
(2)原式=3.6×(4.7+5.3)+
| 1 |
| 2 |
=36+5
=41;
(3)原式=-125×
| 3 |
| 4 |
| 1 |
| 4 |
| 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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