计算:(1)1-36b²(2)0.49p²-144(3)1+10t+25t²(4)m²-14m+49要答案和计算过程和公式
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计算:(1)1-36b²(2)0.49p²-144(3)1+10t+25t²(4)m²-14m+49要答案和计算过程和公式
计算:(1)1-36b²(2)0.49p²-144(3)1+10t+25t²(4)m²-14m+49
要答案和计算过程和公式
计算:(1)1-36b²(2)0.49p²-144(3)1+10t+25t²(4)m²-14m+49要答案和计算过程和公式
1.1-36b²=1²-(6b)²=(1-6b)(1+6b)
2.0.49p²-144=(0.7p)²-12²=(0.7p+12)(0.7p-12)
3.1+10t+25t²=1²+2×1×5t+(5t)²=(1+5t)²
4.m²-14m+49=m²-2×m×7+7²=(m-7)²