问题
解答题
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答案
①x+30%x=65,
1.3x=65,
1.3x÷1.3=65÷1.3,
x=50;
②4-0.7x=0.5,
4-0.7x+0.7x=0.5+0.7x,
0.7x+0.5=4,
0.7x+0.5-0.5=4-0.5,
0.7x=3.5,
0.7x÷0.7=3.5÷0.7,
x=5;
③x:4=
,3 10
x÷4=
,3 10
x÷4×4=
×4,3 10
x=1.2;
④
=0.75 1.5
,x 6
1.5x=0.75×6,
1.5x=4.5,
1.5x÷1.5=4.5÷1.5,
x=3.