a+b=40………………①
a-b=4 ………………②
①+②得:2a=44
a=22
把a(bǔ)=22代入①得:
22+b=40
b=18
∴ a=22
b=18.
a+b=40 a-b=4 求方程的解
a+b=40 a-b=4 求方程的解
數(shù)學(xué)人氣:993 ℃時(shí)間:2020-09-26 04:22:46
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