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# Solution

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1). ? =8787÷342×√50=25.7×7=179.9≈180

2). (?)²=∛15628×(201÷8)
(∵∛15628≈ ∛15625≈25) ≈25×25.125≈25×25
∴ ? =√(25×25)=25

3). ? =7/9 of 4011.33+7/11 of 3411.22
≈7/9×4011+7/11×3411
≈3119.66+2170.63
≈3120+2170=5290

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4). ? =23% of 5783+57% of 8561
= [(23×5783)÷100] + [(57×8561)÷100] =1330.09+4879.77≈1330+4880=6210

5). ? =345.01×224.99÷ (11×5) ≈ 345×(225÷55)
=77625÷55=1411≈1410

6). ? =5.5% of 225+7.5% of 625-18.6% of 182
=12.375+46.875-33.852
≈12+47-34=25

7). ? =√2.25+√6.76+√9.61+√10.89-√23.04
=1.5+2.4+3.1+3.3-4.8=10.3-4.8
=10.3-4.8≈10-5=5

8). ? = 4.4÷1.1×5.89-(2.26+3.86+2.96+5.89) = (4×6)-(2+4+3+6) ≈24-15=9

9). (2.42)²+ (2.68)²+? = (5.96)²+ (7.89)²+ (2.9)²+ (3.1)²≈ (6)²+ (8)²+ (3)²+ (3)²
≈36+64+9+9=118
∴ ? = 118 – {(2.42)²+(2.68)²}
= 118 – (5.86+7.18) ≈118-{6+7} =118-13=105