= 48.(9.8+7.4)+52.(72+2.14)
=48.100+52.100
=100(48+52)
=100.100
=10000
đáp án =10000
= 48.(9.8+7.4)+52.(72+2.14)
=48.100+52.100
=100(48+52)
=100.100
=10000
đáp án =10000
9.8.48+7.4.48+72.52+2.52.14
Tính nhanh:
9.8.48+7.4.48+72.52+2.52.14
Tương tự: Tính hợp lí:
a , 49 − 7. 4 + 7 b , − 48 + 48. − 78 + 48. − 21 c , 45. 56 − 10 − 56. 2 − 45
425. 7.4-170.60
(x-12).4^5=7.4^6
3/7.4/11+3/7.7/11-2
6/7.4/11-6/7.15/11+6/7
5/7.4/15+5/7.11/15+2/7
5/7.4/15+5/7.11/15+2/7