题目内容
计算:
①(-0.75)+(-1
);
②(-2
)-(-3
));
③(2
-3
+1
)÷(-1
);
④-72+2×(-3)2-(-6)÷(-
);
⑤1
×[3×(-
)-1]-8×[(-2)2-(3-4.5)].
①(-0.75)+(-1
| 1 |
| 2 |
②(-2
| 2 |
| 3 |
| 1 |
| 2 |
③(2
| 1 |
| 3 |
| 1 |
| 9 |
| 4 |
| 45 |
| 1 |
| 6 |
④-72+2×(-3)2-(-6)÷(-
| 1 |
| 3 |
⑤1
| 1 |
| 2 |
| 2 |
| 3 |
①原式=-0.75-1.5=-2.225;
②原式=-
+
=-
+
=-
;
③原式=(
-
+
)×
=(
-
+
)×
=-
=-
;
④原式=-49+2×9-(-6)×(-3)=-49;
⑤原式=
×[(-2)-1]-8×[4-(-1.5)]=-48
.
②原式=-
| 8 |
| 3 |
| 7 |
| 2 |
| 14 |
| 6 |
| 21 |
| 6 |
| 5 |
| 6 |
③原式=(
| 7 |
| 3 |
| 28 |
| 9 |
| 49 |
| 45 |
| 6 |
| 7 |
| 105 |
| 45 |
| 140 |
| 45 |
| 49 |
| 45 |
| 6 |
| 7 |
| 12 |
| 45 |
| 4 |
| 15 |
④原式=-49+2×9-(-6)×(-3)=-49;
⑤原式=
| 3 |
| 2 |
| 1 |
| 2 |
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