用简便方法计算!
1.(-30)×(1/2-1/3+3/5-7/10+2/15)=?2.-3.61×0.75+0.61×0.75+(-0.2)×75%=?...
1.(-30)×(1/2-1/3+3/5-7/10+2/15)=?
2. -3.61×0.75+0.61×0.75+(-0.2)×75%=? 展开
2. -3.61×0.75+0.61×0.75+(-0.2)×75%=? 展开
5个回答
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1.(-30)×(1/2-1/3+3/5-7/10+2/15)
=-30×1/2+30×1/3-30×3/5+30×7/10-30×2/15
=-15+10-18+21-4
=-6
2. -3.61×0.75+0.61×0.75+(-0.2)×75%
=0.75×(-3.61+0.61-0.2)
=0.75×(-3.2)
=-2.4
=-30×1/2+30×1/3-30×3/5+30×7/10-30×2/15
=-15+10-18+21-4
=-6
2. -3.61×0.75+0.61×0.75+(-0.2)×75%
=0.75×(-3.61+0.61-0.2)
=0.75×(-3.2)
=-2.4
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(-30)×(1/2-1/3+3/5-7/10+2/15)
=-15+10-18+21-4
=-6
-3.61×0.75+0.61×0.75+(-0.2)×75%
=(-3.16+0.61-0.2)*0.75
=-2.75*0.75
=2.0625
=-15+10-18+21-4
=-6
-3.61×0.75+0.61×0.75+(-0.2)×75%
=(-3.16+0.61-0.2)*0.75
=-2.75*0.75
=2.0625
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1.通分
=-15+10-18+21-4
=-6
2,提公因式
=0.75×(0.61-0.2-3.61)
=0.75×(-3.2)
=-2.4
=-15+10-18+21-4
=-6
2,提公因式
=0.75×(0.61-0.2-3.61)
=0.75×(-3.2)
=-2.4
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1, (-30)×1/2+(-30)×(-1/3)+(-30)×3/5+(-30)×(-7/10)+(-30)×2/15
=-15+10-18+21-4=-6
2, 0.75×(-3.61+0.61-0.2)=0.75×(-3.2)=-2.4
=-15+10-18+21-4=-6
2, 0.75×(-3.61+0.61-0.2)=0.75×(-3.2)=-2.4
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