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简介:
1. (28+36)+64
=28+(36+64)
=28+100
=128
2. 182+18+276+24
=(182+18)+(276+24)
=200+300
=500
3. 400-256-44
=400-(256+44)
=400-300
=100
4. 517-53-47
=517-(53+47)
=517-100
=417
5. 284-159-41
=284-(156+41)
=284-200
=84
6.(4+2)×25
=4×25+2×25
=100+50
=150
7.45×9+55×9
=(45+55)×9
=100×9
=900
8.8×27+73×8
=8×(27+73)
=8×100
=800