用简便方法计算下面各题.5⼀8*12*3⼀4,4⼀7*5⼀6*6,(1⼀5+3⼀4)*20,(5⼀6+2⼀9)*36,12*(3⼀4--1⼀2),

2024-12-02 07:36:49
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回答1:

11/12+5/8+3/8+1/12 5-3/7-4/7 2/5*20+3/5*20 5/6-1/40.25+2/5) =3.4-0.4-0.25 =3-0.25 =2.75 7/8-7/27-20/