niko99
幼苗
共回答了17个问题采纳率:94.1% 举报
12-3/5÷2/3
=12-3/5×3/2
=12-9/10
=11又1/10
12÷(3/5+2/3)
=12÷(9/15+10/15)
=12÷19/15
=12×15/19
=180/19
12÷[3/5×(4/3-1)]
=12÷(3/5×1/3)
=12÷1/5
=12×5
=60
解方程:
2/3x÷4/5=3/8
2/3x=4/5×3/8
2/3x=3/10
x=3/10÷2/3
x=3/10×3/2
x=9/20
x+1/5x=36
(1+1/5)x=36
6/5x=36
x=36÷6/5
x=36×5/6
x=30
1/3x+2/3=6/9
1/3x+2/3=2/3
1/3x=2/3-2/3
1/3x=0
x=0
1年前
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