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
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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 |
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