题目内容
计算(写出计算过程).
(1)(-3.14)+(+4.96)+(+2.14)+(-7.96)
(2)(-2
)+(+5)+(-3
)+(+1.125)+(+4
)
(3)(-3.2)×1.5
(4)1
×(-8)
(5)(-4)×
×(-25)×(-6).
(6)24×(
-
-
)
(7)(
-
-
-
)×(-36)
(8)-99
×9
(9)2011×2
×0×(-389)
(10)-125÷(-25)-64÷(-4)
(11)2×(-3)2-5÷
×2
(12)(-2)3×8-8×(
)3+8÷
.
(1)(-3.14)+(+4.96)+(+2.14)+(-7.96)
(2)(-2
1 |
8 |
1 |
2 |
1 |
2 |
(3)(-3.2)×1.5
(4)1
3 |
4 |
(5)(-4)×
1 |
3 |
(6)24×(
1 |
8 |
1 |
6 |
1 |
4 |
(7)(
1 |
4 |
1 |
9 |
1 |
18 |
1 |
12 |
(8)-99
98 |
99 |
(9)2011×2
1 |
3 |
(10)-125÷(-25)-64÷(-4)
(11)2×(-3)2-5÷
1 |
2 |
(12)(-2)3×8-8×(
1 |
2 |
1 |
8 |
(1)(-3.14)+(+4.96)+(+2.14)+(-7.96)
=-3.14+2.14+4.96-7.96
=-1-3
=-4;
(2)(-2
)+(+5)+(-3
)+(+1.125)+(+4
)
=-2.125+1.125-3.5+4.5+5
=-1+1+5
=5;
(3)(-3.2)×1.5
=-4.8;
(4)1
×(-8)
=-22;
(5)(-4)×
×(-25)×(-6)
=-4×
×25×6
=-200;
(6)24×(
-
-
)
=24×
-24×
-24×
=3-4-6
=-7;
(7)(
-
-
-
)×(-36)
=
×(-36)-
×(-36)-
×(-36)-
×(-36)
=-9+4+2+3
=0;
(8)-99
×9
=(-100+
)×9
=-100×9+
×9
=-900+
=-899
;
(9)2011×2
×0×(-389)
=0;
(10)-125÷(-25)-64÷(-4)
=5+16
=21;
(11)2×(-3)2-5÷
×2
=2×9-5×2×2
=18-20
=-2;
(12)(-2)3×8-8×(
)3+8÷
=-8×8-8×
+8×8
=-64-1+64
=-1.
=-3.14+2.14+4.96-7.96
=-1-3
=-4;
(2)(-2
1 |
8 |
1 |
2 |
1 |
2 |
=-2.125+1.125-3.5+4.5+5
=-1+1+5
=5;
(3)(-3.2)×1.5
=-4.8;
(4)1
3 |
4 |
=-22;
(5)(-4)×
1 |
3 |
=-4×
1 |
3 |
=-200;
(6)24×(
1 |
8 |
1 |
6 |
1 |
4 |
=24×
1 |
8 |
1 |
6 |
1 |
4 |
=3-4-6
=-7;
(7)(
1 |
4 |
1 |
9 |
1 |
18 |
1 |
12 |
=
1 |
4 |
1 |
9 |
1 |
18 |
1 |
12 |
=-9+4+2+3
=0;
(8)-99
98 |
99 |
=(-100+
1 |
99 |
=-100×9+
1 |
99 |
=-900+
1 |
11 |
=-899
10 |
11 |
(9)2011×2
1 |
3 |
=0;
(10)-125÷(-25)-64÷(-4)
=5+16
=21;
(11)2×(-3)2-5÷
1 |
2 |
=2×9-5×2×2
=18-20
=-2;
(12)(-2)3×8-8×(
1 |
2 |
1 |
8 |
=-8×8-8×
1 |
8 |
=-64-1+64
=-1.
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