计算题:(1)-3-(-4)+7(2)8×(?45)÷|?16|(3)(38?16?34)×(?24)(4)(?2)2?|?6|+2?3×(?13)(5)(
计算题:(1)-3-(-4)+7(2)8×(?45)÷|?16|(3)(38?16?34)×(?24)(4)(?2)2?|?6|+2?3×(?13)(5)(?12)+2×...
计算题:(1)-3-(-4)+7(2)8×(?45)÷|?16|(3)(38?16?34)×(?24)(4)(?2)2?|?6|+2?3×(?13)(5)(?12)+2×(?0.5)2+32÷(?3)(6)?32?[?5?0.2÷45×(?2)2].
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(1)-3-(-4)+7
=-3+4+7
=(-3)+(4+7)
=(-3)+11
=+(11-3)
=8;
(2)8×(?
)÷|?16|
=8×(?
)÷16
=8×(?
)×
=-8×
×
=-
;
(3)(
?
?
)×(?24)
=
×(-24)-
×(-24)-
×(-24)
=-9+4+18
=(-9)+(4+18)
=(-9)+22
=+(22-9)
=13;
(4)(?2)2?|?6|+2?3×(?
)
=4-6+2+1
=(4+2+1)-6
=7-6
=1;
(5)(?
)+2×(?0.5)2+32÷(?3)
=(-
)+2×0.25+9÷(-3)
=(-
)+0.5+(-3)
=[(-0.5)+0.5]+(-3)
=0+(-3)
=-3;
(6)?32?[?5?0.2÷
×(?2)2]
=-9-[-5-
×
×4]
=-9-(-5-1)
=-9-[(-5)+(-1)]
=-9-(-6)
=-9+6
=-(9-6)
=-3.
=-3+4+7
=(-3)+(4+7)
=(-3)+11
=+(11-3)
=8;
(2)8×(?
4 |
5 |
=8×(?
4 |
5 |
=8×(?
4 |
5 |
1 |
16 |
=-8×
4 |
5 |
1 |
16 |
=-
2 |
5 |
(3)(
3 |
8 |
1 |
6 |
3 |
4 |
=
3 |
8 |
1 |
6 |
3 |
4 |
=-9+4+18
=(-9)+(4+18)
=(-9)+22
=+(22-9)
=13;
(4)(?2)2?|?6|+2?3×(?
1 |
3 |
=4-6+2+1
=(4+2+1)-6
=7-6
=1;
(5)(?
1 |
2 |
=(-
1 |
2 |
=(-
1 |
2 |
=[(-0.5)+0.5]+(-3)
=0+(-3)
=-3;
(6)?32?[?5?0.2÷
4 |
5 |
=-9-[-5-
1 |
5 |
5 |
4 |
=-9-(-5-1)
=-9-[(-5)+(-1)]
=-9-(-6)
=-9+6
=-(9-6)
=-3.
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