|
1.
74+87 32x50
24+76 25x4
25x（29+71） （62-12）x4
61+39 4x8
2.
55x42+55x18 (42+18)x55
38x43+37x38 (43+37)x38
55x42-55x18 (42-18)x55
38x43-37x38 (43-37)x38
3.
=386+(254+46)
=386+300
=686
=500+(4+536)
=500+540
=1040 05wANG.com
=25x4x8
=100x8
=800
=35x(65+35)
=35x100
=3500
=75x(141-41)
=75x100
=7500
=6  | 