16 calculation, simple calculation, 16 circle perimeter area calculation, 16 equations, 16 word problems, 16 application problems

16 calculation, simple calculation, 16 circle perimeter area calculation, 16 equations, 16 word problems, 16 application problems

30.8÷[14－(9.85＋1.07)]
[60－(9.5＋28.9)]÷0.18
2.881÷0.43－0.24×3.5
20×[(2.44－1.8)÷0.4＋0.15]
28-(3.4+1.25×2.4)
2.55×7.1+2.45×7.1
777×9+1111×3
0.8×[15.5-(3.21+5.79)]
（31.8+3.2×4）÷5
31.5×4÷(6+3)
0.64×25×7.8+2.2
2÷2.5+2.5÷2
194－64.8÷1.8×0.9
36.72÷4.25×9.9
5180－705×6
24÷2.4－2.5×0.8
(4121+2389)÷7
671×15-974
0.8×[7.9-(2+5)]
469×12+1492
405×(3213-3189)
3.416÷（0.016×35）
0.8×[(10－6.76)÷1.2]
C (semicircle) = 51.4m
In a square with an area of 24 square centimeters, draw the largest circle with an area of () square centimeters, and then draw the largest square with an area of () square centimeters
Divide a circle into 16 parts averagely to form an approximate rectangle. The perimeter of the rectangle is 4cm longer than that of the original circle. The area of the original circle is () square centimeter
The sum of circumference, diameter and radius of a circle is 27.84 cm. The area of this circle is () square cm