我们爱天蓝蓝
花朵
共回答了16个问题采纳率:87.5% 举报
一、解方程.
x+(1+15%)=30
x+1.15=30
移项
x=30-1.15
x=28.85
0.5x=0.125*0.4
0.5x=0.05
两边除以0.5
x=0.05÷0.5
x=0.1
二、计算下面各题,能简算的要简算.
7/12*[1÷(1/6+1/8)]
=7/12*1/[(8+6)/6*8]
=7/12*(6*8/14)
=7/12*48/2*7
=48/12*2
=2
2/9*3/4+0.75+7/9*75%
=2/9*3/4+3/4+7/9*3/4
=(2/9+1+7/9)*3/4
=2*3/4
=3/2
1/4÷(5/12+2/5)÷(7/8)
=(1/4)÷[(25+24)/60*7/8]
=60*8/(4*49*7)
=120/343
1/5*47/100+53/100*20%
=1/5*47/100+53/100*1/5
=1/5*(47/100+53/100)
=1/5*1
=1/5
1年前
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