
计算:(1)(-3)+(-9);(2)(-4.7)+3.9;(3)(?312)?514;(4)(?1225)÷(?35);(5)(?3)×56×
计算:(1)(-3)+(-9);(2)(-4.7)+3.9;(3)(?312)?514;(4)(?1225)÷(?35);(5)(?3)×56×(?95)×(?14);(...
计算:(1)(-3)+(-9);(2)(-4.7)+3.9;(3)(?312)?514;(4)(?1225)÷(?35);(5)(?3)×56×(?95)×(?14);(6)?2.5÷58×(?14);
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(1)(-3)+(-9)=-3-9=-12;
(2)(-4.7)+3.9=-0.8;
(3)(?3
)?5
=?8
;
(4)(?
)÷(?
)=?
×(?
)=
;
(5)(?3)×
×(?
)×(?
)=-
×
×
=?
;
(6)?2.5÷
×(?
)=
×
×
=1.
(2)(-4.7)+3.9=-0.8;
(3)(?3
1 |
2 |
1 |
4 |
3 |
4 |
(4)(?
12 |
25 |
3 |
5 |
12 |
25 |
5 |
3 |
4 |
5 |
(5)(?3)×
5 |
6 |
9 |
5 |
1 |
4 |
5 |
2 |
9 |
5 |
1 |
4 |
9 |
8 |
(6)?2.5÷
5 |
8 |
1 |
4 |
5 |
2 |
8 |
5 |
1 |
4 |
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