
计算:(1)3×(-4)+28÷(-7)(2)?3.5÷78×(?34)(3)1124?(38+16
计算:(1)3×(-4)+28÷(-7)(2)?3.5÷78×(?34)(3)1124?(38+16?34)×24(4)123+(-45)-(+15)+13....
计算:(1)3×(-4)+28÷(-7)(2)?3.5÷78×(?34)(3)1124?(38+16?34)×24(4)123+(-45)-(+15)+13.
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(1)3×(-4)+28÷(-7)
=-12-4
=-16;
(2)?3.5÷
×(?
)=
×
×
=3;
(3)1
?(
+
?
)×24
=1
-(
×24+
×24-
×24)
=1
-(9+4-18)
=6
;
(4)1
+(-
)-(+
)+
=1
+
-
-
=2-1
=1.
=-12-4
=-16;
(2)?3.5÷
7 |
8 |
3 |
4 |
7 |
2 |
8 |
7 |
3 |
4 |
(3)1
1 |
24 |
3 |
8 |
1 |
6 |
3 |
4 |
=1
1 |
24 |
3 |
8 |
1 |
6 |
3 |
4 |
=1
1 |
24 |
=6
1 |
24 |
(4)1
2 |
3 |
4 |
5 |
1 |
5 |
1 |
3 |
=1
2 |
3 |
1 |
3 |
4 |
5 |
1 |
5 |
=2-1
=1.
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