Tính:
9123 + 123,5 * 61,3 =
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\(\left(1,1+1,2+1,3+1,4+...+1,9\right)\times\left(123,5-24,7\times5\right)\)
\(=\left[\left(1,1+1,9\right)+\left(1,2+1,8\right)+\left(1,3+1,7\right)...+1,5\right]\times\left(123,5-24,7\times5\right)\)
\(=\left(3+3+3+3+1,5\right)\times\left(123,5-123,5\right)\)
\(=12,5\times0\)
\(=0\)
A = ( 1,1 + 1,2 + 1,3 +.....+ 1,19) \(\times\) ( 123,5 - 24,7 \(\times\)5)
A = ( 1,1 + 1,2+ 1,3 +.....+ 1,19) \(\times\) ( 123,5 - 123,5)
A = ( 1,1 + 1,2 + 1,3 +.....+ 1,19) \(\times\) 0
A = 0
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\(2345\times34:100+123,5-123,3\)
\(=79730:100+123,5-123,3\)
\(=797,3+123,5-123,3\)
\(=797,3-123,3+123,5\)
\(=674+123,5\)
\(=797,5\)
\(2345\times34:100+123,5-123,3\)
\(=79730:100+123,5-123,3\)
\(=797,3+123,5-123,3\)
\(=920,8-123,3\)
\(=797,5\)
_Chúc bạn học tốt_
467,8 x 123,5 -22,5 x 467,8 - 467,8
= 467,8 .123,5 -22,5. 467,8 - 467,8.1
= 467,8(123,4 -22,4 -1)
= 467,8.100
= 46780
467,8 x 123,5 - 22,5 x 467,8 - 467,8
= 467,8 x 123,5 - 22,5 x 467,8 - 467,8 x 1
= 467,8 x ( 123,5 - 22,5 - 1 )
= 467,8 x 100
= 46780
9123 + 123.5 x 61.3 = 9123 + 7570.55
= 16693.55
16693,55