70%x+(30-x)55%=30乘65%是多少?

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70%x+(30-x)55%=30乘65%是多少?
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70%x+(30-x)55%=30乘65%是多少?
70%x+(30-x)55%=30乘65%是多少?

70%x+(30-x)55%=30乘65%是多少?
0.7x+16.5-0.55x=19.5
0.7x-0.55x=19.5-16.5
0.15x=3
x=3÷0.15
x=20

少了+1/6
=1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8