tính bằng cách thuận tiện nhất:
( 36 : 0,25 - 72 * 2) * ( 1+2+3+...+100 )
làm nhanh nhé
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\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)
\(=1235\text{×}6789\text{×}\left(630-630\right)\)
\(=1235\text{×}6789\text{×}0=0\)
\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)
\(=167\text{×}67+167\text{×}33\)
\(=167\text{×}\left(67+33\right)\)
\(=167\text{×}100=16700\)
\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)
\(=72+72+72+72+24+168\)
\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)
Ta có :
\(A=\frac{1}{3}-\frac{3}{4}-\left(-\frac{3}{5}\right)+\frac{1}{72}-\frac{2}{9}-\frac{1}{36}+\frac{1}{15}\)
\(\Rightarrow A=\frac{5}{15}-\frac{54}{72}+\frac{9}{15}+\frac{1}{72}-\frac{16}{72}-\frac{1}{72}+\frac{1}{15}\)
\(\Rightarrow A=\left(\frac{5}{15}+\frac{9}{15}+\frac{1}{15}\right)+\left(-\frac{54}{72}+\frac{1}{72}-\frac{16}{72}-\frac{2}{72}\right)\)
\(\Rightarrow A=1-\frac{71}{72}=\frac{1}{72}\)
345,25 : 0,125 + 345,25 : 0,25 + 345,25 :1/2
= 345,25 : 0,125 + 345,25 : 0,25 + 345,25 :1/2
=345,25x8+345,25x4+345,25x0,5
=345,25x(8+4+0,5)
=345,25x12.5
=4315.625
\(36\text{×}5+72\text{×}2-216+144\)
\(=36\text{×}5+36\text{×}2\text{×}2-36\text{×}6+36\text{×}4\)
\(=36\text{×}5+36\text{×}4-36\text{×}6+36\text{×}4\)
\(=36\text{×}\left(5+4-6+4\right)=36\text{×}7=252\)
6,28 : 0,25 + 6,28 x 6
= 6,28 x 4 + 6,28 x 6
= 6,28 x ( 4 + 6 )
= 6,28 x 10
= 62,8
6,28 : 0,25 + 6,28 x 6
= 6,28 x 4 + 6,28 x 6
= 6,28 x ( 4 + 6 )
= 6,28 x 10
= 62,8
k mk nha
Mk cảm ơn bạn nhiều
Thank you very much
( ^ _ ^ )
Tính thuận tiện :
2x 4 x 8 x 0,5 x 0,125 x 0,25 x ( 0,4321 + 0,5679 )
= 2 x 4 x 8 x 0,5 x 0,125 x 0,25 x 1
= ( 2 x 0,5 ) x ( 4 x 0,25 ) x ( 8 x 0,125 ) x 1
= 1x1x1x1
= 1
Tính nhanh :
72,9 x 99 + 72 + 0,9
= 72,9 x 99 + 72,9
= 72,9 x 99 + 72,9 x 1
= 72,9 x ( 100 x 1 )
= 72,9 x 100
= 7290
Câu 1:
2 * 4 * 8 *0,5 * 0,125 * 0,25 * (0,4321 + 0,5679)
= (0,5 * 2) * (4 * 0,25) * (8 * 0,125) * 1
= 1 * 1 * 1 * 1 = 1
Câu 2:
72,9 * 99 + 72 + 0,9
= 72,9 * 99 + 72,9
= 72,9 * (99 + 1)
= 72,9 * 100
= 7290
120+[1+2+3...+9+100]x[4x9-36]
=120+1+2+3...+9+100]x0
=120+0
=120
\(=\dfrac{45\cdot100\cdot0.25}{35\cdot100\cdot36}=\dfrac{45}{36}\cdot\dfrac{0.25}{35}=\dfrac{5}{4}\cdot\dfrac{1}{140}=\dfrac{1}{28\cdot4}=\dfrac{1}{112}\)
\(13,25:0,5+13,25:0,25+13,25:0,125\)
\(=13,25:\left(0,5+0,25+0,125\right)\)
\(=13,25:0,875\)
\(\approx15,15\)
13,25:0,5+13,25:0,25+13,25+0,125
=13,25:(0,5+0,25+0,125)
=13,25:0,875
=15,1428571
=(144-144)x(1+2+3+...+100)
=0x(1+2+3+...+100)=0