题目计算:(1)−∣−7∣+3−2×(−12)(1)-|-7|+3-2×(-\frac{1}{2})(1)−∣−7∣+3−2×(−21)；(2)−22+(−2)3×5−(−0.28)÷(−2)2(2)-2^{2}+\left(-2\right)^{3}\times 5-\left(-0.28\right)\div \left(-2\right)^{2}(2)−22+(−2)3×5−(−0.28)÷(−2)2.知识点：有理数的混合运算章节：未标注
