Đáp án:
câu 1.
41×36 + 59×90 + 41×84 + 59×30
=(41×36+41×84) + (59×90+59×30)
=41×(36+84)+59×(90+30)
=41×120 + 59 × 120
= (41 + 59)×120
=100×120
=12000
Câu 2.
a, 1727 + [ 6993 : 111 + (148 - 95) × 4 - 2 ]
=1727 + ( 63 + 53×4 - 2)
=1727 + (63 +212 - 2)
=1727 + 273
=2000
b, 600 : { 450 : [450 - ( 4×125 - 8 × 25 )]}
= 600 : { 450 : [450 - ( 500- 200 )]}
= 600 : [ 450 : (450 - 300) ]
= 600 : ( 450 : 150)
= 600 : 3
= 200