问题
解答题
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答案
(1)6×409-2300
=2454-2300
=154;
(2)528+60×8
=528+480
=1008;
(3)1100-(560+690)
=1100-1250
=-150;
(4)7×(555-377)
=7×178
=1246;
(5)200-(76+40)
=200-116
=84;
(6)220-(45×3-60)
=220-(135-60)
=220-75
=145.