
计算下列各题(1)9+(-10)+(-2)-(-3)(2)1+(-2)+|-2-3|-5(3)4?(?2)÷13×(?3)(4)?23÷49×(
计算下列各题(1)9+(-10)+(-2)-(-3)(2)1+(-2)+|-2-3|-5(3)4?(?2)÷13×(?3)(4)?23÷49×(?23)2+(?0.8)?...
计算下列各题(1)9+(-10)+(-2)-(-3)(2)1+(-2)+|-2-3|-5(3)4?(?2)÷13×(?3)(4)?23÷49×(?23)2+(?0.8)?5×(?122)(5)(512+23?34)×(?12)(6)(-79)÷214+49×(-29)
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(1)原式=9-10-2+3
=0;
(2)原式=1-2+5-5
=-1;
(3)原式=4-(-2)×3×(-3)
=4-18
=-14;
(4)原式=-8×
×
-0.8-5×(-
)
=-8-0.8+1.25
=-7.55;
(5)原式=-(
×12+
×12?
×12)
=-5-8+9
=-4;
(6)原式=-79×
+
×(-29)
=
×(-79-29)
=
×(-108)
=-48.
=0;
(2)原式=1-2+5-5
=-1;
(3)原式=4-(-2)×3×(-3)
=4-18
=-14;
(4)原式=-8×
9 |
4 |
4 |
9 |
1 |
4 |
=-8-0.8+1.25
=-7.55;
(5)原式=-(
5 |
12 |
2 |
3 |
3 |
4 |
=-5-8+9
=-4;
(6)原式=-79×
4 |
9 |
4 |
9 |
=
4 |
9 |
=
4 |
9 |
=-48.
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