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0,4×2,25=0,900
25%=25/100=0,25
0,900-0,25=0,65
0,4×2.1/4-25%
→4/10×9/4-25/100
→36/40-25/100
→180/100-50/100
→130/200
→0,65
Jawabannya 0,65