(1)x÷0.7+1.2乘3=4.1(2)6.4x+3.6x=100(3)(x+4.6)÷1.2=7.8 (4)1.6x-0.4x=24(5)0.75乘18÷0.1
问题描述:
(1)x÷0.7+1.2乘3=4.1(2)6.4x+3.6x=100(3)(x+4.6)÷1.2=7.8 (4)1.6x-0.4x=24(5)0.75乘18÷0.1
乘是乘号不是x.回答时把题号写上,列方程解答,(真够惨的,原来是会的,可现在忘了,老师又出了这种题,我就不会了.)
答
(1)x÷0.7+1.2乘3=4.1
x*7/10=4.1-3.6
x*7/10=0.5
x=5/7
(2)6.4x+3.6x=100
10x=100
x=10
(3)(x+4.6)÷1.2=7.8
x+4.6=6.5
x=6.5-4.6
x=0.9
(4)1.6x-0.4x=24
0.8x=24
x=30
(5)0.75乘18÷0.1
=7.5×18
=135