问题 解答题
耐心算一算
(1)
2
3
+(-
1
8
)-(-
1
3
)+(-
3
8
)

(2)3.5÷(-
7
8
)×(-
3
4
)

(3)(
1
4
+
1
6
-
1
2
)×(-12)
(4)(-3)2×(-2)-[(-2)×(-1)]2
(5)(4x2y-3xy2)-(1+4x2y-3xy2
(6)4y2-[3y-(3-2y)+2y2].
答案

(1)原式=(

2
3
+
1
3
)+(-
1
8
-
3
8
)=1-
1
2
=
1
2

(2)原式=

7
2
×(-
8
7
)×(-
3
4
)=3;

(3)原式=-3-2+6=1;

(4)原式=9×(-2)-4=-18-4=-22;

(5)原式=4x2y-3xy2-1-4x2y+3xy2=-1;

(6)原式=4y2-3y+3-2y-2y2=2y2-5y+3.

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