题目内容
计算:
①-21
+3
-
-0.25
②-(
+
-
-
)×24
③-12-(-32)×(-
)2×
÷(-5
)
④3(x2-2xy)-2(x2-2y)+(x2-4y)
①-21
2 |
3 |
3 |
4 |
1 |
3 |
②-(
1 |
2 |
2 |
3 |
3 |
4 |
11 |
12 |
③-12-(-32)×(-
1 |
2 |
4 |
5 |
2 |
5 |
④3(x2-2xy)-2(x2-2y)+(x2-4y)
①原式=(-21
-
)+(3.75-0.25)
=-22+3.5
=-18.5;
②原式=-12-16+18+22
=12;
③原式=-1+9×
×
×(-
)
=-1-
=-1
;
④原式=3x2-6xy-2x2+4y+x2-4y
=2x2-6xy.
2 |
3 |
1 |
3 |
=-22+3.5
=-18.5;
②原式=-12-16+18+22
=12;
③原式=-1+9×
1 |
4 |
4 |
5 |
5 |
27 |
=-1-
1 |
3 |
=-1
1 |
3 |
④原式=3x2-6xy-2x2+4y+x2-4y
=2x2-6xy.
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