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B)
70%-48
100%-X
X=100*48/70
X~`68
3,1+2,15×6,1+1,1×2,6= 3,1+13,1+2,9=19,06
3,1(23)=1546/495
48:70%=48*10/7=68i4/7
3,1+2,15×6,1+1,1×2,6=3,1+13,115+2,86=16,215+2,86=19,075