丹阳市第八中学初一新生暑假数学作业(一)——2
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(5)=(2-11.9+8.4×4/3)÷1.3
=1.3÷1.3
=1
(6)=2/51×9×17+5/18×9×17
=6+42.5
=48.5
(7)=5/24×48+7/12×48-2/3×48
=10+28-32
=6
(8)=1/4×1/7+1/7×3/4+6/7
=(1/4+3/4)×1/7+6/7
=1
(9)=1/8÷(2-0.25-0.75)
=1/8÷1
=1/8
(10)=172/85
(11)=(1/2-3/20)×10/7
=7/20×10/7
=1/2
(12)=8/9×(3/4-7/16+1/4)
=8/9×9/16
=1/2
(13)=1.9+1.9
=3.8
(14)=8×22/7÷(1÷0.25)
=8×22/7×1/4
=44/7
(15)=20×1/20×7/15
=1×7/15
=7/15
(16)=1/15×5/12×12
=1/36×12
=1/3
(17)=(5/6-1/6-1/10)×15/17
=17/30×15/17
=1/2
(18)=8/5×15/2-(11/9+7/9)
=12-2
=10
(19)=17/4÷1.5-17/6
=17/4×2/3-17/6
=0
(20)=7/11÷(2/5-3/10)
=7/11÷1/10
=70/11
(21)=2/5×15/8
=3/4
(22)=7.69×10
=76.9
(23)=1/8÷1/6
=3/4 |
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