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125×括号10+16括号奥数怎么做

125×(10+16) =125×(8×3+2) =125×8×3+125×2 =1000×3+250 =3250。

10×(12+16) =10×(10+2+16) =10×(10+18) =10×10+10×18 =100+180 =280

7.5 80 24

2+2=4 2+4=6 4+6=10 6+10=16 10+16=26 16+26=42 26+42=68

16(x+y)²+40(x+y)(x-y)+25(x-y)² =[4(x+y)+5(x-y)]² =(4x+4y+5x-5y)² =(9x-y)²

应该是+16

(-26)+52+16+(-72) =-26+52+16-72 =-26-72+52+16 =-98+68 =-30

解: (-16又3/4)-(-10又1/4)-(+1又1/2) =-16又3/4+10又1/4-1又1/2 =(-16+10-1)+(-3/4+1/4-1/2) =-7+(-2/4-1/2) =-7+(-1/2-1/2) =-7-1 =-8

5+10+1=16 10+16+1=27 16+27+1=44

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