Question

注:/分数线,在分数线前的叫分子.5-7/30×10/11 解方程:5-1/2x=3/4 x+3/10x=20 简便运算

Answer 1

5-7/30×10/11 5-1/2x=3/4 x+3/10x=20

=5-7/33 1/2x=5-3/4 (1+3/10)x=20

=4又26/33 1/2x÷1/2=17/4÷1/2 13/10x÷13/10=20÷13/10

x=17/2 x=200/13

12×（1/4+1/6-1/3） 9×9/13+9/13÷9

=12×1/4+12×1/6-12×1/3 =(9+1/9)×9/13

=3+2-4 =82/9×9/13

=1 =82/13

(希望你的题目没打错）