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Bài giải
a) 280 : 14 x 71= 20 x 71 = 1420
b)125 x 88: 11= 125 x ( 88: 11)= 125 x 8 = 1000
Nhớ k cho mình đó nnha!
\(a,280\times71:14=280:14\times71=20\times71=1420\)
\(b,125\times88:11=125\times\left(88:11\right)=125\times8=1000\)
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Hướng dẫn giải:
a) 280 x 71 : 14 = (280 : 14) x 71 = 20 x 71 = 1420
b) 125 x 88 : 11 = 125 x (88 : 11) = 125 x 8 = 1000
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71 x 25 + 71 x 19 + 44 x 29
= 71 x ( 25 + 19 ) + 44 x 29
= 71 x 44 + 44 x 29
= 44 x ( 71 + 29 )
= 44 x 100
= 4400
71x25+71x19+44x29
=71x(25+19)+44x29
=71x44+44x29
=44x(71+29)=44x100=4400
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\(\frac{15\times14-1}{13\times15+14}\)
\(=\frac{15\times\left(13+1\right)-1}{13\times15+14}\)
\(=\frac{15\times13+15-1}{15\times13+14}\)
\(=\frac{15\times13+14}{15\times13+14}\)
\(=1.\)
280 x 71 : 14
= 280 : 14 x 71
= 20 x 71
= 1420
280 x 71 : 14 = 1420