问题
解答题
计算(写出计算过程). (1)(-3.14)+(+4.96)+(+2.14)+(-7.96) (2)(-2
(3)(-3.2)×1.5 (4)1
(5)(-4)×
(6)24×(
(7)(
(8)-99
(9)2011×2
(10)-125÷(-25)-64÷(-4) (11)2×(-3)2-5÷
(12)(-2)3×8-8×(
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答案
(1)(-3.14)+(+4.96)+(+2.14)+(-7.96)
=-3.14+2.14+4.96-7.96
=-1-3
=-4;
(2)(-2
)+(+5)+(-31 8
)+(+1.125)+(+41 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
×(-8)3 4
=-22;
(5)(-4)×
×(-25)×(-6)1 3
=-4×
×25×61 3
=-200;
(6)24×(
-1 8
-1 6
)1 4
=24×
-24×1 8
-24×1 6 1 4
=3-4-6
=-7;
(7)(
-1 4
-1 9
-1 18
)×(-36)1 12
=
×(-36)-1 4
×(-36)-1 9
×(-36)-1 18
×(-36)1 12
=-9+4+2+3
=0;
(8)-99
×998 99
=(-100+
)×91 99
=-100×9+
×91 99
=-900+1 11
=-899
;10 11
(9)2011×2
×0×(-389)1 3
=0;
(10)-125÷(-25)-64÷(-4)
=5+16
=21;
(11)2×(-3)2-5÷
×21 2
=2×9-5×2×2
=18-20
=-2;
(12)(-2)3×8-8×(
)3+8÷1 2 1 8
=-8×8-8×
+8×81 8
=-64-1+64
=-1.