问题
解答题
解方程或解比例. ①6×(x+2.1)=18; ②
③
|
答案
①6×(x+2.1)=18
6x+12.6=18
6x+12.6-12.6=18-12.6
6x=5.4
6x÷6=5.4÷6
x=0.9
②
=1.25x 4
×4=1.25×4x 4
x=5
③
=20:66 x
20x=6×6
20x=36
x=1.8
解方程或解比例. ①6×(x+2.1)=18; ②
③
|
①6×(x+2.1)=18
6x+12.6=18
6x+12.6-12.6=18-12.6
6x=5.4
6x÷6=5.4÷6
x=0.9
②
=1.25x 4
×4=1.25×4x 4
x=5
③
=20:66 x
20x=6×6
20x=36
x=1.8