求求你们帮我个忙数学题要过程 做2 3题记住过程题目如下
2个回答
展开全部
13/16-X=3/8
13/16-6/16=X
x=7/16
X-4.5=20
X=20+4.5=24.5
2-3/7-4/7=2-(3/7+4/7)=2-1=1
5/8-1/3+5/12=5/8+(5/12-4/12)=5/8+1/12=15/24+2/24=17/24
7/10+5/6+1/5-1/2=(7/10+2/10)+(5/6-3/6)=9/10+2/6=9/10+1/3=27/30+10/30=37/30
5/6-1/12+1/4-5/12=5/6+1/4-(1/12+5/12)=5/6+1/4-6/12=10/12+3/12-6/12=7/12
5/16+3/7-2/7-1/16=(5/16-1/16)+(3/7-2/7)=4/16+1/7=1/4+1/7=7/28+4/28=11/28
13/16-6/16=X
x=7/16
X-4.5=20
X=20+4.5=24.5
2-3/7-4/7=2-(3/7+4/7)=2-1=1
5/8-1/3+5/12=5/8+(5/12-4/12)=5/8+1/12=15/24+2/24=17/24
7/10+5/6+1/5-1/2=(7/10+2/10)+(5/6-3/6)=9/10+2/6=9/10+1/3=27/30+10/30=37/30
5/6-1/12+1/4-5/12=5/6+1/4-(1/12+5/12)=5/6+1/4-6/12=10/12+3/12-6/12=7/12
5/16+3/7-2/7-1/16=(5/16-1/16)+(3/7-2/7)=4/16+1/7=1/4+1/7=7/28+4/28=11/28
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