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68x62Xx52怎么巧算

=(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

((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 -...

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

=16×2×62+88×(1+37) =16×124+8×11×38 =16×124+8×11×2×19 =16×124+16×219 =16×343 =5488

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

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

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

5.65×0.2-0.62=5.65×0.2-3.1×0.2=8.75×0.2=1.75

=32✘62+34✘2✘62 =62✘(32+68) =6200

0.98x0.62 =(10-0.02)x0.62 =10x0.62-0.02x0.62 =6.2-0.0124 =6.1876 希望能帮到你

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