计算下面各题.(1)75+25×12=(2)64×128÷(32×64)=(3)72×(13-12+34)=(4)14÷(11-813-513)=(5)23×1324+1324=(6)2.2-8÷11-211×7=(7)1012+(812-537)=(8)856-(756-316)=
计算下面各题. (1)75+25×12= | (2)64×128÷(32×64)= |
(3)72×(-+)= | (4)÷(11--)= |
(5)23×+= | (6)2.2-8÷11-×7= |
(7)10+(8-5 )= | (8)8-(7-3)= |
(9)(+)×7+= | (10)1×85+120%×7+1.2×8= |
(11)20÷[×(-)]= | (12)1×(5.8-4.4×2)×(0.7-)= |
(13)(2.5×4.8)×÷(2.4×2)= | (14)15÷1-(5÷5.75)×4= |
(15)3333×6666+9999×7778= | (16)357×256256-356×255255 |
(17)1+2+3+…1999= | (18)×+×+×= |
(19)++++= | (20)1-+-+作业帮用户2017-10-09
扫二维码下载作业帮
拍照搜题,秒出答案,一键查看所有搜题记录
|
答案和解析
(1)75+25×12
=75+300
=375;
(2)64×128÷(32×64)
=64×128÷32÷64
=(64÷64)×(128÷32)
=1×4
=4;
(3)72×(
-
+
)
=72×
-72×
+72×
=24-36+54
=24+54-36
=78-36
=42;
(4)
÷(11-
-
)
=
÷[11-(
+
)]
=
÷[11-1]
=
÷10
=
;
(5)23×
+
=(23+1)×
=24×
=13;
(6)2.2-8÷11-
×7
=2.2-
-
=2.2-(
+
)
=2.2-2
=0.2;
(7)10
+(8
-5
)
=(10
+8
)-5
=19-5
=13
;
(8)8
-(7
-3
)
=8
-7
+3
=1+3
=4
;
(9)(
+
)×7+
=
×7+
×7+
=5+
+
=5+(
7 |
15 |
相关问答
上面写不下,我写在下面填符号1.(1)1/2()0.4()3/10()0.1=1(2)1/2()0 2020-05-13 …
1+2+3+n=2分之1n(n+1),n是正整数,研究1*2+2*3+你(n+1),观察1*2=3 2020-05-20 …
天才进1,1,2,1,2,1,2,3,3,1,3,2,1,2,3,3,1,3,2,1,3,2,3, 2020-05-21 …
找规律填空(1)9,3,1,1/3,().(2)8,2,(),1/8,1/32.(3)3/9找规律 2020-07-18 …
计算:1/3+3+1又1/211又1/4÷(1-1/2-1/4)23-3又8/9÷3/8×2又1/ 2020-07-18 …
1-1/22=3/4=(1/2)*(3/2);1-1/32=8/9=(2/3)*(4/3);1-1 2020-07-22 …
寻找规律解数学题1/1*2=1-1/22/2*3=1/2-1/31/3*4=1/3-1/4……计算 2020-07-22 …
对于算式2*(3+1)*(3*3+1)*(3*3*3*3+1)*(3*3*3*3*3*3*3*3+ 2020-07-30 …
由下列各式:1>1/2,1+1/2+1/3>1有下列各式:1>1/2;1+1/2+1/3>1;1+1 2020-10-30 …
Limx→0(1/1-x-3/1-x^3)已经知道lim[1/(1-x)-3/(1-x^3)]=li 2020-10-31 …