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7.6×3/14加17.5×6/25用简便方法计算

7.6×3/14+17.5×6/25 =11.4/7+21/5 =(11.5*5+21*7)/35 =(57.5+147)/35 =204.5/35 =409/70

(100*7.6*7/4+100*17.5*6/25)/100=(25*7.6*7+4*17.5*6)/100=(25*4*1.9*7+4*25*0.7*6)/100=(100*13.3+100*4.2)/100=(13.3+4.2)*100/100=17.5*1=17.5

37.6减(7.6加3.25)怎样用简便方法计算? 37.6减(7.6加3.25) =37.6-7.6-3.25 =30-3.25 =26.75

解: 原式=35.4-25.5+14.6-14.2 =(35.4+14.6)-(25.5+14.2) =50-39.7 = 10.3

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(1) 5 12 × 7 25 × 3 14 ,= 7 60 × 3 14 ,= 1 40 ;(2) 5 6 × 1 4 + 5 6 × 3 4 ,=( 1 4 + 3 4 )× 5 6 ,=1× 5 6 ,= 5 6 ;(3) 3 86 ×85,= 3 86 ×(86-1),= 3 86 ×86- 3 86 × 1,=3- 3 86 ,=2 83 86 .

17.5

=25×2×19×2×3 =25×2×2×(19×3) =100×57 =5700

计算: 3.25x6.7+3.25x3.3 =3.25x(6.7+3.3) =3.25x10 =32.5

8/5×7+8/1×5 =8/5×(7+1) =8/5×8 =5 6/5×25-6/1×85 =6/5×(25-17) =6/5×8 =3/20

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