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=50 22 27 × 3 4 + 5 27 × 3 4=( 22 5 3 27 + 27 )× 4=1× 3 4= 3 4 76 + 5 12 × 12 ×6=( 7 5 12 + 12 )×6=1×6=6 4 6 7 × 13 + 3 7 × 6 13=( 4 3 6 7 + 7 )× 13 6 × 7 6 2 13 5 - 13 × 5= 6( 7 2 13 × 5 - 5 )= 6 13 ×1= 6 133 3 7 + 4 3 8 × 11 11 ×3 8=3 3 8 ×( 7 4 11 + 11 )=3 3 8 ×1=3 3 8 16 7 3 5 × 13 - 5 × 7 13=( 16 3 7 5 - 5 )× 13 6 13 7=1×=× 13 5 13 6 7== 13 5 2 2 3 4×7+×521×+×21 3 3=( 2 3 + 2 3 )×5=1×5=5 63 100 ×101= 63 100 ×(100+1)= 63 100 ×100+ 63 100=63+ 63 100=63 63 100 5 27 ×28= 5 27 ×(27+1)= 5 27 ×27+ 5 27 ×1 7 7=21×( 3 7 + 4 7 )=21×1=21 6 77 ×78= 6 77 ×(77+1)= 6 77 ×77+ 6 77 ×1=6+ 6 77=6 6 7737× 3 35=(35+2)× 3 35=35× 3 35 +2× 3 35 5 6=5+=3+ 27 35 5 6=5=3 27 35 34 634××12 35=(35-1)× 34 35=35× 34 35 -1× 34 35=34- 34 35=33 1 354 4 5 ×10 25=(4+ 4 5 )×10=4×10+ 4 5 ×10=40+8=483 4 5 ×25=(3+ 4 5 )×25 13= 6 13 ×(13-1)= 6 6 13 ×13- 13 ×1=6- 6 13=5 7 13 3 8 ×8=(25+ 3 8 )×8=(25×8+ 3 8 )×8=200+3=203( 1 + 3 5 7 )×7×5= 1 3 5 ×7×5+ 7 ×7×5 4=3×25+×25=7+15 5=75+20=22=95 7 1 5 5 (-)×5×12 (-)×6×18 12 5= 7 ×5×12- 1 12 5 ×5×12=35-12=23 7 10 ×101- 7 10 12= 7 10 ×(101-1)= 7 10 ×100=70 9 5 ×19+ 9 5 23= 9 5 ×(19+1)= 9 5 ×20=36 6 9 5- 5 6 ×6×18 9 ×6×18=90-60=30× 6 13 + 6 13=(12+1)× 6 13=13× 6 13=6× 3 3 4 + 4=(23+1)× 3 4=24× 3 4=18=