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1. 14-24-12
= -10 - 12
= -10 + (-12)
= -22
2. (-25)+30-15
= 5-15
= -10
3. 13-31
= -18
CHÚC BẠN HỌC GIỎI
1. 14-24-12
=14+(-24)+(-12)
=[14+(-24)]+(-12)
=-10+(-12)
=-22
2. (-25)+30-15
=(-25)+30+(-15)
=[(-25)+(-15)]+30
=-40+30=-10
3. 13+31=-18
![](https://rs.olm.vn/images/avt/0.png?1311)
a,(-30).7-14.(8-15)
=(-30).7-14.(-7)
=(-30).7-(-14).7
=7.[(-30)-(-14)]
=7.(-16)
=-112
b,(-13)+(-25)-6
=(-38)-6
=-44
c,125:(-25)+[(3-2^2)^2013].(-5)
=(-5)+[(3-4)^2013].(-5)
=(-5)+[(-1)^2013].(-5)
=(-5)+(-1).(-5)
=(-5).(-1+1)
=(-5).0
=0
d tính như bình thường nhé ( dùng máy tính cho nhanh)
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C = 555 - 100 - 80 + 333 = 708
D = 98 . 42 - { 50 . (5 + 9)} = 4116 - 700 = 3416
E = 129 - 199 + 29 = - 41
F = (- 54).(-9) + 35.(-20) = 486 - 700 = - 214
G = - 25 . 30 - 75 . 20 = - 750 - 1500 = - 2250
M = - 12 . (-11) + 2 . (-9) = 132 - 18 = 114
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Mình lớp 4 mà bạn
Với lại là bằng :
6''675
7785.,77
664'87'9776''8
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d=43/37d=43/37 × 23/15−43/3723/15−43/37 × 8/15+31/378/15+31/37
=43/37=43/37 x 23/15+43/3723/15+43/37 x (−8/15)+31/37(−8/15)+31/37
=43/37(23/15−8/15)+31/37=43/37(23/15−8/15)+31/37
=43/37.1+31/37=43/37.1+31/37
=2=2
E=−5/24E=−5/24 × 9/11−5/249/11−5/24 × 2/11+7/122/11+7/12
=−5/24(9/11+2/11)+7/12=−5/24(9/11+2/11)+7/12
=−5/24.1+7/12=−5/24.1+7/12
=3/8=3/8
a)3/7–−11/14−7/3×6/7a)3/7–−11/14−7/3×6/7
=3/7−−11/14−2=3/7−−11/14−2
=3/7+11/14−2=3/7+11/14−2
=−11/14=−11/14
b)6/5:3/2+−2/3×9/14b)6/5:3/2+−2/3×9/14
=4/5−3/7=4/5−3/7
=13/35
d=43/37d=43/37 × 23/15−43/3723/15−43/37 × 8/15+31/378/15+31/37
=43/37=43/37 x 23/15+43/3723/15+43/37 x (−8/15)+31/37(−8/15)+31/37
=43/37(23/15−8/15)+31/37=43/37(23/15−8/15)+31/37
=43/37.1+31/37=43/37.1+31/37
=2=2
E=−5/24E=−5/24 × 9/11−5/249/11−5/24 × 2/11+7/122/11+7/12
=−5/24(9/11+2/11)+7/12=−5/24(9/11+2/11)+7/12
=−5/24.1+7/12=−5/24.1+7/12
=3/8=3/8
a)3/7–−11/14−7/3×6/7a)3/7–−11/14−7/3×6/7
=3/7−−11/14−2=3/7−−11/14−2
=3/7+11/14−2=3/7+11/14−2
=−11/14=−11/14
b)6/5:3/2+−2/3×9/14b)6/5:3/2+−2/3×9/14
=4/5−3/7=4/5−3/7
=13/35
= [ 32.(14+31) - 45] . [ 32.(25-24) ]
= ( 32 . 45 - 45 ) . (32.1)
= 45.(32-1) . 32
= 45.8.9
= 3240