Đáp án:
Giải thích các bước giải:
a) 5²·3²-32÷2²
=25·9-32÷4
=225-8
=217
b) 19·37+63·19-400
=19·(37+63)-400
=19·100-400
=1900-400
=1500
c) 205-{102-[48-(16-14)]}
=205-{102-[48-2]}
=205-{102-46}
=205-56
=149
d)20·5²-3²·30+170
=20·25-9·30+170
=500-270+170
=230+170
=400
e) 600÷{450÷[450-(4·5³-2³·5²)]}
=600÷{450÷[450 -(4·125-8·25)]}
=600÷{450÷[450-(500-200)]}
=600÷{450÷[450-300]
=600÷{450÷150}
=600÷3
=200
=