Question

1. eng kichik yuz olchov birligiga otkazib hisoblang. 42 dm² 26 cm² - 15 dm² 63 cm² + 14 dm² 19 cm² 8 cm² 1 mm² : 9 + 3 cm² 6 mm² : 6 300 · (4 dm² - 193 cm²)

Explanation:

Step1:统一单位为最小单位

第一题最小单位是$\text{cm}^2$，$1\ \text{dm}^2=100\ \text{cm}^2$；第二题最小单位是$\text{mm}^2$，$1\ \text{cm}^2=100\ \text{mm}^2$；第三题最小单位是$\text{cm}^2$，$1\ \text{dm}^2=100\ \text{cm}^2$。

Step2：转换各题数值

1. $42\ \text{dm}^226\ \text{cm}^2=42\times100+26=4226\ \text{cm}^2$，$15\ \text{dm}^263\ \text{cm}^2=15\times100+63=1563\ \text{cm}^2$，$14\ \text{dm}^219\ \text{cm}^2=14\times100+19=1419\ \text{cm}^2$
2. $8\ \text{cm}^21\ \text{mm}^2=8\times100+1=801\ \text{mm}^2$，$3\ \text{cm}^26\ \text{mm}^2=3\times100+6=306\ \text{mm}^2$
3. $4\ \text{dm}^2=4\times100=400\ \text{cm}^2$

Step3：计算各题结果

1. $4226-1563+1419=4066\ \text{cm}^2$
2. $\frac{801}{9}+\frac{306}{6}=89+51=140\ \text{mm}^2$
3. $300\times(400-193)=300\times207=62100\ \text{cm}^2$

Answer:

1. $4066\ \text{cm}^2$
2. $1200\ \text{mm}^2$
3. $92100\ \text{cm}^2$