Question

列方程并解答一瓶墨水X元,一支笔1.2元,一共四元,求钢笔的元数.(解方程.)一瓶X元的墨水有3瓶,共8.4元,求每瓶墨

Answer 1

X+1.2=4 x=2.8

3*X=8.4 x=2.8

1.6X=6.4 x=4

X÷3=2.1 x=0.7

X-2=15 x=17