Tính thuận tiện nhất
A)\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
B) \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
C)\(\frac{26.108-26.12}{32-28-24-20+16-12+8-4}\)
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Cảm ơn vì đã giải cho mk nè
Những câu hỏi liên quan
\(a,\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
\(b,\frac{26.108-26.12}{32-28+24-20+16-12+8-4}\)\(c,\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}\)
B= \(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
Tính nhanh
\(B=\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}=\frac{315.3+372.3+372.7+315.7}{26.13+74.14}=\frac{315.\left(7+3\right)+372.\left(7+3\right)}{26.13+74.14}=\frac{3150+3720}{26.13+74.14}\)
đến đấy bó tay
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\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
= \(\frac{\left(372+315\right).\left(3+7\right)}{2.\left(169+518\right)}\)
= \(\frac{678.10}{2.687}\)
= 5
~ Hok tốt ~
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\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
= \(\frac{\left(372+315\right).\left(3+7\right)}{2.\left(169+518\right)}\)
= \(\frac{687.10}{2.687}\)
= 5
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\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
\(\frac{\left(315+372\right).3+\left(372+315\right)}{26.13+74.14}\)
( 315+372 ) . 3 + ( 372 + 315 )
= (315+315) + (372+372) . 3
= 630 + 744 . 3
= 1374 . 3
= 4122
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Tính: \(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
tính nhanha) 5 . 3 - 32 : 2b) 19 . 37 + 63 . 19 - 400c) 205 - { 102 - [ 48 - ( 16 - 14 ) ] }d) 5 : 5 - 3 : 3e) 25 . 3 + 253 . 72 + 253g) 18 [ ( 3 . 24 + 3 . 4 - 27 . 3 ) - 71 . 1 ] - 80h) frac{left(315+372right).3+left(372+315right).7}{26.13+74.14} i) frac{2004.2005+2006.20+1985}{2006.2005-2001:2005}Chú ý : dấu gạch ngang thay cho dấu chia nhé
Đọc tiếp
tính nhanh
a) 5 . 3 - 32 : 2
b) 19 . 37 + 63 . 19 - 400
c) 205 - { 102 - [ 48 - ( 16 - 14 ) ] }
d) 5 : 5 - 3 : 3
e) 25 . 3 + 253 . 72 + 253
g) 18 [ ( 3 . 24 + 3 . 4 - 27 . 3 ) - 71 . 1 ] - 80
h) \(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
i) \(\frac{2004.2005+2006.20+1985}{2006.2005-2001:2005}\)
Chú ý : dấu gạch ngang thay cho dấu chia nhé
\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.48}\)=?
\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.48}\)
\(=\frac{\left(315+372\right).\left(3+7\right)}{\left(26.13\right)+\left(74.48\right)}\)
\(=\frac{687.10}{39+3552}\)
\(=\frac{6870}{3890}=\frac{687}{389}\)
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tính \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
