分数乘法分配律练习题 ( 712- 1 5 )×60 ( 1 6 + 8 9 )×18 ( 5 6 - 5 9 )× 18 5 ( 1 1 0 + 1 5 )×5 ( 8 9 + 4 2 7 )×27 90×( 2 1 8 + 7 3 0 ) ( 3 5 + 2 2 5 )×2 5 1 6 ×(12+23 ) ( 1 5 2 4 - 3 8 )× 6 1 5 2 4 ×( 7 2 4 + 5 6 + 3 4 ) (4 8 + 8 3 )× 1 2 4 ( 7 20 - 1 5 )×20 ( 5 6 - 5 9 )×1 8 ( 1 5 + 3 7 )×3 5 4 1 7 ×( 3 4 + 1 7 2 ) 4 8 ×( 1 1 2 4 + 1 6 + 5 1 2 ) 2 2 2 7 × 3 4 + 5 2 7 × 3 4 6 1 3 × 7 5 - 6 1 3 × 2 5 7 1 2 ×6 + 5 1 2 ×6 3 3 8 × 7 1 1 + 4 1 1 ×3 3 8 4 7 × 6 13 + 3 7 × 6 13 16 5 × 7 13 - 3 5 × 7 13 2 3 ×7 + 2 3 ×5 2 1 × 3 7 + 4 7 ×2 1 63 100 ×101 6 77 ×78 5 27 ×28 3 7 × 3 35 34× 34 35 6 13 ×12 4 4 5 ×10 25 3 8 ×8 3 4 5 ×25 ( 1 5 + 3 7 )×7 ×5 ( 7 12 - 1 5 )×5×12 ( 5 6 - 5 9 )×6×18 7 10 ×101- 7 10 12× 6 13 + 6 13 9 5 ×19+ 9 5 23× 3 4 + 3 4 详解答案 ( 712- 1 5 )×60 ( 1 6 + 8 9 )×18 = 712×60- 1 5 ×60 = 1 6 ×18+ 8 9 ×18 =35-12 =3+16 =23 =19 ( 5 6 - 5 9 )× 18 5 ( 1 1 0 + 1 5 )×5 = 5 6 × 18 5 - 5 9 × 18 5 = 1 1 0 ×5+ 1 5 ×5 =3-2 = 1 2 +1 =1 =1 1 2 ( 8 9 + 4 2 7 )×27 90×( 2 1 8 + 7 3 0 ) = 8 9 ×27+ 4 2 7 ×27 =90× 2 1 8 +90× 7 3 0 =2 4 +4 =1 0 +2 1 =28 =3 1 ( 3 5 + 2 2 5 )×2 5 1 6 ×(12+23 ) = 3 5 ×2 5 + 2 2 5 ×2 5 = 1 6 ×12+ 1 6 ×23 =15+2 =2 + 1 9 =1 7 =2 1 9 ( 1 5 2 4 - 3 8 )× 6 1 5 2 4 ×( 7 2 4 + 5 6 + 3 4 ) = 1 5 2 4 × 6 1 5 - 3 8 × 6 1 5 =2 4 × 7 2 4 +2 4 × 5 6 +2 4 × 3 4 = 1 4 - 3 2 ...