小学六年纪上册解方程5/6(x+6)=120X－2/7X=3/470%X+20%X=3.625%+10X=4/5X-15%X=68X＋3/8X＝121

Question

小学六年纪上册解方程
5/6(x+6)=120
X－2/7X=3/4
70%X + 20%X = 3.6
25% + 10X =4/5
X - 15%X = 68
X＋3/8 X＝121

Answer 1

5/6(x+6)=120可化解为5（x+6）=720所以x=138
X－2/7X=3/4两边同时乘以28可化解为28x-8x=21 x=21/20
70%X + 20%X = 3.6可化解为0.7x+0.2x=3.6所以0.9x=3.6 x =4
25% + 10X =4/5可化解为0.25+10*x=0.8 10x=0.55 x=0.055
X - 15%X = 68可化解为x-0.15x=68 所以0.85x=68 x=80
X＋3/8 X＝121可化解为8x+3x=121*8即11x=968 所以x=88