问题 解答题
解方程:
0.2X-3.4=7.27(X-1.2)=2.12+1.8-5X=3.66X+4X-11=2.9.
答案

(1)0.2X-3.4=7.2,

0.2X-3.4+3.4=7.2+3.4,

0.2x=10.6,

0.2x÷0.2=10.6÷0.2,

x=53;

(2)7(X-1.2)=2.1,

7(X-1.2)÷7=2.1÷7,

x-1.2=0.3,

x-1.2+1.2=0.3+1.2,

x=1.5;

(3)2+1.8-5X=3.6,

3.8-5x+5x=3.6+5x,

3.8-3.6=3.6+5x-3.6,

0.2=5x,

0.2÷5=5x÷5,

x=0.04;

(4)6X+4X-11=2.9,

10x-11+11=2.9+11,

10x=13.9,

10x÷10=13.9÷10,

x=1.39.

选择题
单项选择题