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热心网友 时间:2024-11-03 03:18
12/13乘以3/7加4/7乘以12/13加12/13
=12/13×(3/7+4/7+1)
=12/13×2
=24/13
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5x77x2+(7/8)x(12/13)+(7/8)÷13
=77x10+(7/8)x(12/13+1/13)
=770+7/8
=770又8分之7
12/13x3/7+ 4/7x 12/13
= 12/13x(3/7+4/7)
= 12/13x
= 12/13
原式=(55-5/12)*(12+7/5)+(45+7/12)*(12-3/5)
= 55*12 + 55*(7/5) -(5/12)*12 -(5/12)*(7/5)
+45*12 - 45*(3/5) +(7/12)*12 -(7/12)*(3/5)
=55*12 + 77- 5 - 7/12 + 45*12 - 27 + 7 - 21/60
=(55+45)*12 + 77 - 27 - 5 + 7 - 7/12 - 21/60
=100*12 + 52 -14/15
=1251 + 1 - 14/15
=1251又15分之1
4/13×12/7-3/7×12/13
=12/13×4/7-3/7×12/13
=12/13×(4/7-3/7)
=12/13×1/7
=12/91
12/13×3/7+4/7×12/13+12/13
=12/13x(3/7+4/7+1)
=12/13x2
=24/13
12/125*128+128*13/25
=128*(12/125+13*25)
=128*(12/125+65/125)
=128*77/125
=78.848
把带分式化简得
原式为-25/13*47/15-28/15*64/13+3*28/15
后两项都有28/15,一提得
=-25/13*47/15+28/15*(3-64/13)
=-25/13*47/15-28/15*25/13
=-25/13*(47/15+28/15)
=-25/13*5
=-125/13
;12/25×99+2/25 =12/25×100-12/25+2/25 =48-2/5=47.6