小学分数乘法分配律练习题及答案7 1 1 8 (-)×60 (+)×1812 5 6 97 1 1 8=×60-×60=×18+×1812 5=35-12=23( 5 6 - 5 18 9 )× 5= 5 6 × 18 5 - 5 18 9 × 5=3-2=1( 8 4 9 + 27 )×27 90= 827+ 4 9 × 27 ×27=24+4=28( 3 2 5 + 25 )×25= 3 2 5 ×25+ 25 ×25 6 9=3+16=19( 1 1 10 + 5 )×5= 15+ 1 10 × 5 ×5= 1 2 +1=1 1 2×( 2 7 18 + 30 )=90× 2 7 18 +90× 30=10+21=31 12 6 ×(12+3 )= 1+ 12 6 ×12 6 ×3 1=15+2=2+ 9 1=17=2 9 15 3 6 7 5 3( 24 - 8 )× 1524×( 24 + 6 + 4 )= 15 6 3 6 24 × 15 - 8 × 15= 1 3 4 - 20= 1 10(48+ 8 1 3 )× 24 (=48× 1 8 1 24 + 3 × 24=2+ 1 9=2 1 9( 5 - 5 6 9 )×18= 518- 5 6 × 9 ×18=15-10=5=24× 7× 5 3 24 +24 6 +24× 4=7+20+18=45 7 20 - 1 5 )×20= 7 1 20 ×20- 5 ×20=7-4=3( 1 3 5 + 7 )×35= 1 3 5 ×35+ 7 ×35=7+15=22 4 3 17 11 1 5 17 ×( 4 + 2 )48×( 24 + 6 + 12 ) 4 3 4 17 11 1 5= 17 × 4 + 17 × 2=48× 24 +48× 6 +48× 12 3= 17 +2=22+8+20 3=2 17=