整式的加减计算题 计算题18.4-2.7+1.6-0.3 ( 4 7 + 4 21 - 1 3 )×42 1 6
计算题18.4-2.7+1.6-0.3 ( 4 7 + 4 21 - 1 3 )×42 1 6
计算题18.4-2.7+1.6-0.3 ( 4 7 + 4 21 - 1 3 )×42 1 6
(1)18.4-2.7+1.6-0.3,=(18.4+1.6)-(2.7+0.3),
=20-3,
=17;(2)4.28×7.75+0.428×22.5,
=0.428×77.5+0.428×22.5,
=0.428×(77.5+22.5),
=0.428×100,
=42.8;
(3)(
4 7+
4 21-
1 3)×42,
=
×42+
4 21×42-
1 3×42,
=24+8-14,
=18;
(4)(
1 6+
7 15)÷
2 5+
5 12,
=
×
5 2+
5 12,
=
+
5 12,
=2;
(5)
1 6-
3 8÷
7 4×
7 12,
=
-
3 8×
4 7×
7 12,
=
-
1 8,
=
;
(6)3.6÷[0.6×(0.8+0.7)],
=3.6÷[0.6×1.5],
=3.6÷0.9,
=4.
计算题:(1) - 2 3 ×(-6)+ 7 4 ÷(- 7 8 ) ;(2) - 1 4 +[1 1
(1) - 2 3 ×(-6)+ 7 4÷(-
7 8)
=4+(-2)
=2;
(2) - 1 4 +[1
-(
3 8+
1 6-
3 4)×24]÷5
=-1+[1
-
3 8×24-
1 6×24+
3 4×24]÷5
=-1+[1
-9-4+18]÷5
=-1+
×
1 5=-1+
29 24=
5 24.
计算题.12 ÷ 4 7 1 3 ÷ 1 4 5 6 ÷ 5 18
12 ÷ 4 7 =12× 7 4=21;
1 3÷
1 4=
1 3×4 =
4 3;
5 6÷
5 18=
5 6×
18 5=3.
计算题(1)-21-12+33+12-67(2) ( 1 2 - 3 4 + 5 6 - 7 12 )÷(-
(1)原式=(-21-12-67)+(33+12)=-110+45
=-55;(2)原式=( 1 2
-
3 4+
5 6-
7 12)×(-36)
=-18+27-30+21
=0;
(3)原式=48÷(-8+4)
=48÷(-4)
=-12;
(4)原式=-1×(-5)÷(9-10)
=-1×(-5)÷(-1)
=-5.
计算题:(1)2-5+4-(-7)+(-6)(2)(-1 1 3 )÷0.8×(- 6 7 )(3)(2
(1)原式=2-5+4+7-6=-3+4+7-6
=1+7-6
=2;(2)原式=(- 5 3
)÷
4 5×(-
6 7)
=(-
)×
5 4×(-
6 7)
=(-
)×(-
6 7)
=
;
(3)原式=(
9 4-
9 2-
9 8)×(-
8 9)
=
×(-
8 9)-
9 2×(-
8 9)-
9 8×(-
8 9)
=-2+4+1
=3;
(4)原式=-4×(-
1 2)+8×
1 4=2+2
=4;
(5)原式=-1+8÷(-2)+8
=-1-4+8
=5.
计算题:(1)-3-(-4)+7(2) 8×(- 4 5 )÷|-16| (3) ( 3 8 - 1 6 -
(1)-3-(-4)+7=-3+4+7
=(-3)+(4+7)
=(-3)+11
=+(11-3)
=8;
(2) 8×(- 4 5 )÷|-16|
= 8×(- 4 5
)÷16
= 8×(-
)×
1 16=- 8×
4 5×

1 16
=-
2 5;
(3) (
-
1 6-
3 4)×(-24)
=
×(-24)-
1 6×(-24)-
3 4×(-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 + 3 2 ÷(-3)
=(-
)+2×0.25+9÷(-3)
=(-
)+0.5+(-3)
=[(-0.5)+0.5]+(-3)
=0+(-3)
=-3;
(6) - 3 2 -[-5-0.2÷
× (-2) 2 ]
=-9-[-5-
×
5 4×4]
=-9-(-5-1)
=-9-[(-5)+(-1)]
=-9-(-6)
=-9+6
=-(9-6)
=-3.
计算题:(1)(-5)-(+4)+(-8)-(+7)+(+24);(2)-42÷4×(-14)+2×(-3)-|-5|;(3)-5-[(
(1)原式=-5-4-8-7+24=-24+24=0;
(2)原式=-16×
×(-
1 4)-6-5=1-6-5=-10;
(3)原式=-5-(-8+
)÷(-2)=-5-
21 5=-9
1 5;
(4)原式=8+2-36+4-1=-23.
脱式计算题①( 3 7 + 1 3 )×42+ 1 2 ②18÷[ 5 6 -(
①( 3 7 + 1 3)×42+
1 2=
3 7×42+
1 3×42+
1 2,
=18+14+
,
=32+
,
=32
;
②18÷[
5 6-(
5 8-
1 6)],
=18÷[
+
1 6-
5 8],
=18÷[1-
],
=18÷
,
=48;
③
2 15×[7.5-(
1 8+0.125÷
1 7)]
=
×[7.5-(
1 8×1+
1 8×7)],
=
×[7.5-
1 8×(1+7)],
=
×[7.5-1],
=
×6.5,
=
.
计算题:(1)(-17)+59+(-37)(2)(+7)-(+8)+(-3)-(-6)+2(3)( 1 4 + 1
(1)原式=-17+59-37=5;(2)原式=7-8-3+6+2
=4;
(3)原式=
1 4×(-12)+
1 6×(-12)-
1 2×(-12)
=-3-2+6
=1;
(4)原式=
3 2×(-
5 6)
=-
;
(5)原式=(-
9 5)×
25 9+(-
3 8)÷(-
3 4)
=-5+
=-
9 2.