Tính nhanh nhất : 115.145-(185-40).4+(394-174).2
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a) 174 x 78 - 174 x 68
= 174 x (78-68)
= 174 x 10
= 1740
b) 1/3 +1/6 + 4/3 + 2/6 +2/3 + 5/6
= (1/3 + 2/3 + 4/3) + (1/6 + 2/6 + 5/6)
= 7/3 + 4/3
= 11/3
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1) \( 2155 – (174 + 2155) + (-68 + 174) = -68\) 2) \(-25 . 72 + 25 . 21 – 49 . 25=-2500\) 3) \(35.(14 –23) – 23.(14–35)=168\) 4) \(8154 – (674 + 8154) + (–98 + 674)=-98\) 5) \(25.21+25.72+49.25=2399\) 6) \(27.(13-16)-16.(13-27)=143\) 7) \(–1911 – (1234 – 1911) =-1234\) |
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a) \(30\times1235\times4-8\times235\times15\)
\(=120\times1235-120\times235\)
\(=120\times\left(1235-235\right)\)
\(=120\times1000\)
\(=120000\)
b) \(\left(120\times99+120\right)-185\times101+185\)
\(=120\times\left(99+1\right)-185\cdot\left(101-1\right)\)
\(=120\times100-185\times100\)
\(=12000-18500\)
\(=-6500\)
a) 30 x 1235 x 4 - 8 x 235 x 15
=(30x4) x 1235 - (8x15)x235
= 120 x 1235 - 120 x 235
=120 x (1235-235)
=120 x 1000
=120000
b) ( 120 x 99 +120) - 185 x 101-185
=(120 x 99 + 120) - (185x101+185)
=120x(99+1) - 185x(101+1)
=120 x 100-185x102
=12000-18870
= -(18870-12000)
= -6870
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Danh ra dai lam len ban nho chu y dau de nhe, trong day co nhung co 5 phep.
Câu hỏi của Nguyễn Hương Giang - Toán lớp 6 - Học toán với OnlineMath
1) 2155 - (174 + 2155) + (-68+174)
= 2155 - 174 - 2155 + (-68) + 174
=(2155 - 2155) - (174 - 174) + (-68)
= -68
2) -25 . 72 + 25 . 21 - 49 . 25
= 25 . (-72 + 21 - 49)
= 25 . (-100)
= -2500
3) 8154 - (674 + 8154) + (-98 + 674)
= 8154 - 674 - 8154 + (-98) + 674
= (8154 - 8154) - (674 - 674) + (-98)
= -98
4) -25.21+ 25.72 + 49.25
= 25. (-21 + 72 + 49)
= 25. 100
= 2500
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1) 2155 - (174 + 2155) + (-68 + 174)
=2155-174-2155-68+174
=(2155-2155)+(-174+174)-68
=0+0-68
=-68
2) -25 . 72 + 25 . 21 - 49 . 25
=25.(-72+21-49)
=25.(-100)
=-2500
3) 35(14 - 23) - 23(14 - 35)
=35.(-9)-23.(-21)
=(-315)-(-483)
=168
4) 8154 - (674 + 8154) + (-98 + 674)
= 8154-674-8154-98+674
=(8154-8154) + (-674+674) - 98
=0+0-98
=-98
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\(185:0,25+185\) x \(95+185\)
\(=185\) x \(4+185\) x \(95+185\) x \(1\)
\(=185\) x \(\left(4+95+1\right)\)
\(=185\) x \(100=18500\)
115.145-(185-40).4+(394-174).2
= 16675-145.4+220.2
= 16675-580+440
= 16535