已知5x+0.8=19.3,那么2x-1.4=_.
问题描述:
已知5x+0.8=19.3,那么2x-1.4=______.
答
解; 5x+0.8=19.3,
5x+0.8-0.8=19.3-0.8,
5x=18.5,
5x÷5=18.5÷5,
x=3.7;
将x值代入2x-1.4得:2×3.7-1.4=6.
故答案为:6.