计算或化简:(1)(14?16+19)×(-36)(2)-32×(-2)+42÷(-2)3(3)-22-(1-15×0.2)÷(-2)3
计算或化简:(1)(14?16+19)×(-36)(2)-32×(-2)+42÷(-2)3(3)-22-(1-15×0.2)÷(-2)3(4)(2x?y)?2(4x+12...
计算或化简:(1)(14?16+19)×(-36)(2)-32×(-2)+42÷(-2)3(3)-22-(1-15×0.2)÷(-2)3(4)(2x?y)?2(4x+12y)+2012(5)-3(2x?y)?2(4x+12y)+2012(6)3x2y?2[12x2y?(x2y?14x2)?2x2].
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(1)(
?
+
)×(-36)=-9+6-4=-7;
(2)-32×(-2)+42÷(-2)3=-9×(-2)+16÷(-8)=18-2=16;
(3)-22-(1-
×0.2)÷(-2)3=-4-(1-
)÷(-8)=-4+
=-3
;
(4)(2x?y)?2(4x+
y)+2012=2x-y-8x-y+2012=-6x-2y+2012;
(5)-3(2x?y)?2(4x+
y)+2012=-6x+3y-8x-y+2012=-14x+2y+2012;
(6)3x2y?2[
x2y?(x2y?
x2)?2x2]=3x2y-2[
x2y-x2y+
x2-2x2]=3x2y-x2y+2x2y-
x2+4x2=4x2y+
x2.
1 |
4 |
1 |
6 |
1 |
9 |
(2)-32×(-2)+42÷(-2)3=-9×(-2)+16÷(-8)=18-2=16;
(3)-22-(1-
1 |
5 |
1 |
25 |
3 |
25 |
22 |
25 |
(4)(2x?y)?2(4x+
1 |
2 |
(5)-3(2x?y)?2(4x+
1 |
2 |
(6)3x2y?2[
1 |
2 |
1 |
4 |
1 |
2 |
1 |
4 |
1 |
2 |
7 |
2 |
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