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Answers to five synchronous exercises in mathematics
2. (12x6+12x4+4x6) x2 = 208 (square centimeter) 7x7x6=294 (square centimeter)

3. (0.8x0.75x4+0.75x0.75x2) x100 = 352.5 (square meter)

4.50x30+(30x0.9+50x0.9) x2 =1644 (square meter)

5.7.2x7.2=5 1.84 (square decimeter)

6.(40- 15x2)/2=5 (cm)

(15x5+15x10+10x5) x2 = 550 (square centimeter)

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