69.12÷3.6+69.12÷6.4 35×0.5+65÷2 0.96×9.9+0.96×0.1 （61.2-61.2×0.9）÷0.25 7.89-（3.27+2.89） （52.9-3.3）÷（80×0.25）

69.12÷3.6+69.12÷6.4=69.12÷（3.6+6.4）=69.12÷10=6.912
35×0.5+65÷2=(35+65)÷2=100÷2=50
0.96×9.9+0.96×0.1 =0.96×(9.9+0.1)=0.96×10=9.6
（61.2-61.2×0.9÷0.25=61.2×(1-0.9)÷0.25=6.12÷4=1.53
7.89-（3.27+2.89）=7.89-2.89-3.27=5-3.27=1.73
（52.9-3.3）÷（80×0.25）=49.6÷20=2.48

69.12÷3.6+69.12÷6.4
=69.12÷（3.6+6.4）
=69.12÷10
=6.912

35×0.5+65÷2
=35×二分之一+65×二分之一
=（35+65）×二分之一
=50

0.96×9.9+0.96×0.1
=0.96×（9.9+0.1）
=0.96×10
=9.6
（61.2-61.2×0.9）÷0.25
=（61.2×1-61.2×0.9)×4
=61.2×4-61.2×3.6
=61.2×0.4
=24.48
7.89-（3.27+2.89）
=7.89-3.27-2.89
=5-3.27
=1.73
（52.9-3.3）÷（80×0.25）
=49.6÷20
=2.48

69.12÷(3.6+6.4)=6.912 35÷2+65÷2=(35+65)÷2=50 0.96X(9.9+0.1)=9.6
61.2x(1-0.9)÷0.25=24.48 7.89-2.89-3.27=1.73 49.6÷20=2.48

69.12÷3.6+69.12÷6.4
=69.12÷（3.6+6.4）
=69.12÷10
=6.912
35×0.5+65÷2
=35×1/2+65×1/2
=（35+65）×1/2
=100×0.5
=50
0.96×9.9+0.96×0.1
=0.96×（9.9+0.1）
=0.96×10
=9.6
（61.2-61.2×0.9）÷0.25
=（61.2×1-61.2×0.9)×4
=61.2×4-61.2×3.6
=61.2×0.4
=24.48
7.89-（3.27+2.89）
=7.89-3.27-2.89
=5-3.27
=1.73
（52.9-3.3）÷（80×0.25）
=2.48

69.12÷3.6+69.12÷6.4 35×0.5+65÷2 0.96×9.9+0.96×0.1 =69.12÷（3.6+6.4） =35×1／2+65×1／2 =0.96×（9.9+0.1）=69.12÷10 =（35+65）×1／2 =0.96×10=6.912 =100×1／2 =9.6=50（61.2-61.2×0.9）÷0.25 ...