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(1)613+(-4.6)+(-25)-2.3-(-23)(2)4−(−123)÷13×(−35)(3)[6×(−23)2−52×(−223)]÷(−6)2(4)(xy2-x2y)-(2x2y-3xy2)(5)先化简再求值:-2y3+(2x3-xyz)-2(x3-y3+xyz),其中x=1,y=-2,z=-3.
题目详情
(1)6
+(-4.6)+(-
)-2.3-(-
)
(2)4−(−1
)÷
×(−
)
(3)[6×(−
)2−52×(−
)]÷(−6)2
(4)(xy2-x2y)-(2x2y-3xy2)
(5)先化简再求值:-2y3+(2x3-xyz)-2(x3-y3+xyz),其中x=1,y=-2,z=-3.
1 |
3 |
2 |
5 |
2 |
3 |
(2)4−(−1
2 |
3 |
1 |
3 |
3 |
5 |
(3)[6×(−
2 |
3 |
22 |
3 |
(4)(xy2-x2y)-(2x2y-3xy2)
(5)先化简再求值:-2y3+(2x3-xyz)-2(x3-y3+xyz),其中x=1,y=-2,z=-3.
▼优质解答
答案和解析
(1)原式=6
-4.6-
-2.3+
=(6
+
)-(4.6+0.4+2.3)
=7-7.3
=-0.3;
(2)原式=4-
×3×
=4-3
=1;
(3)原式=(6×
+25×
)×
=36×
=1;
(4)原式=xy2-x2y-2x2y+3xy2
=4xy2-3x2y;
(5)原式=-2y3+2x3-xyz-2x3+2y3-2xyz
=-3xyz,
当x=1,y=-2,z=-3时,原式=-3×1×(-2)×(-3)=-18.
1 |
3 |
2 |
5 |
2 |
3 |
=(6
1 |
3 |
2 |
3 |
=7-7.3
=-0.3;
(2)原式=4-
5 |
3 |
3 |
5 |
=4-3
=1;
(3)原式=(6×
4 |
9 |
4 |
3 |
1 |
36 |
=36×
1 |
36 |
=1;
(4)原式=xy2-x2y-2x2y+3xy2
=4xy2-3x2y;
(5)原式=-2y3+2x3-xyz-2x3+2y3-2xyz
=-3xyz,
当x=1,y=-2,z=-3时,原式=-3×1×(-2)×(-3)=-18.
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