一、解方程(详细点) (1)4.5×6+4x=41 (2)7x-3.4x=0.72 (3)2

一、解方程(详细点)

(1)4.5×6+4x=41

(2)7x-3.4x=0.72

(3)2x+1.5x=42

(4)(x-4.5)×6=318

(5)27-17x=13.4

(6)(x+1.7)÷3=1.4

(1)4.5×6+4x=41
27+4x=41
4x=41-27
4x=14
x=14/4
x=3.5

(2)7x-3.4x=0.72
(7-3.4)x=0.72
3.6x=0.72
x=0.72/3.6
x=0.2
(3)2x+1.5x=42
(2+1.5)x=42
3.5x=42
x=42/3.5
x=12
(4)(x-4.5)×6=318
6x-4.5*6=318
6x-27=318
6x=318+27
6x=345
x=345/6
x=57.5
(5)27-17x=13.4
17x=27-13.4
17x=13.6
x=13.6/17
x=0.8
(6)(x+1.7)÷3=1.4
x+1.7=1.4*3
x+1.7=4.2
x=4.2-1.7
x=2.5
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第1个回答  2015-11-20
1、解:4x=41 - 27
4x=14
x=14÷4
x=7/2
2、解:(7 - 3.4)x=0.72
3.6x=0.72
x=0.72÷3.6
x=0.2
3、解:(2 + 1.5)x=42
3.5x=42
x=42÷3.5
x=12
4、解:x - 4.5=318÷6
x=53 + 4.5
x=57.5
5、解:-17x=13.4 - 27
-17x=-13.6
x=-13.6÷(-17)
x=0.8
6、解:x + 1.7=1.4×3
x=4.2 - 1.7
x=2.5
第2个回答  2015-11-20
(1)4.5×6+4x=41
27+4x=41 4x=14 x=3.5
(2)7x-3.4x=0.72
3.6x=0.72 x=0.02
(3)2x+1.5x=42
3.5x=42 x=12
(4)(x-4.5)×6=318
x-4.5=503 x=507.5
(5)27-17x=13.4
27=13.4+17x 13.6=17x 0.8=x
(6)(x+1.7)÷3=1.4 x+1.7=4.2 x=2.5
第3个回答  2015-11-20

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第4个回答  2015-11-20

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