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Answer» 21.let x=0.4777.......(1) multiply equation (1)with 100 100x=0.4777*100 = 47.77.......(2) subtract (2)from (1) 100x=47.77 X=0. 4777 _________ 99x=47.293 x=47.293/99 x=0.4777070 bar 22.(100+4)(100-4)=(100)²-(4)² =10000-16 =9984 (102)3 (102)3 = (100 + 2)3 = (100)3 + (2)3 + 3(100)(2)(100 + 2) (| Using IDENTITY (a+b)^3) = 1000000 + 8 + 600(100 + 2) = 1000000 + 8 + 60000 + 1200 =1061208 |
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