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लगभग83=8×33×3=243=4.8983=1.633 लगभग
2707x=27.07⇒x=270727.07=2707×1002707=100दोनों ओर का वर्ग करने पर,x=(100)2=10000
पाँच अंकों की बड़ी से बड़ी संख्या =99999अतः अभीष्ट संख्या =99999−143 =99856
24+21696=6×4+6×6×616×6=26+6646=8646=2
75.24+x=8.71⇒75.24+x=75.8641⇒x=75.8641−75.24⇒x=0.6241
0.081×0.4840.0064×6.25=81×48464×625=9×228×25=198200=0.99
0.2890.00121=289×100121=17×1011=17011
32.4x=2⇒32.4x=4⇒x=32.44=8.1
x0.09=12⇒x0.3=12⇒x=3.6
1+25144=1+x12⇒144+25144=1+x12⇒169144=1+x12⇒1312−1=x12⇒13−1212=x12⇒x=1
15612+154+225=15612+154+15=15612+169=15612+13=15625=125
128+160−16=4×4×4×2+4×4×5×2−4×4=82+410−4=11.314+12.649−4=19.96
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