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68x62Xx52怎么巧算

((5 × 3) 3) 6 60: 6 (3 3 × 5) 86: 5 × 3 (3 6) 61: ((3 × 5) 3) 6 21: 3 × ((6 5) - 3) 53: 3 (6 5 × 3) 48: (5 × 6) - (3 3) 79: (3 × 5) 3 6 19: (5 - 3 6) × 3 66: 6 × (3 × 3 - 5) 91: 3 × (5 (6 - 3)) 36: 3 × (6 - (3 - 5)) 45: (5 (6 -...

=(60+8)×(60+2)-(60-2)×(60-8) =(60×60+60×2+8×60+8×2)-(60×60-60×8-2×60+8×2) =60×60+60×2+8×60+8×2-60×60+60×8+2×60-8×2 =60×2+8×60+60×8+2×60 =60×(2+8)×2 =60×10×2 =1200

69x78+39x62 =69x78+78x31 =(69+31)x78 =100x78 =7800

62*72-48*18 =62*72-12*4*18 =62*72-12*72 =(62-12)*72 =50*72 =3600

2×38+32×62 =2X(100-62)+32X62 =200+(32-2)X62 =200+30X62 =200+1860 =2060

62×34+38×20+38×14 原式=62×34+(38×20+38×14) =62×34+38×(20+14) =62×34+38×34 =(62+38)×34 =100×34 =3400

8.62x 5.7 =8.62x(6-0.3) =8.62x6-8.62x0.3 =51.72-2.586 =49.134

37x125x(62-54)=37x125x8=37x5x2x5x2x5x2=37x1000=37000

=29*2*31+42*31 =58*31+42*31 =(58+42)*31 =100*31=3100

.85/3.1×0.62x1.4/0.17x4 =0.85/0.17×0.62/3.1×1.4×4 =5×0.2×1.4×4 =5.6

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