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简介:
1)125 ×(17 × 8)× 4
= 125×8×4×17
=1000×68
=68000
2)375 × 480 + 6250 × 48
=480×(375+625)
=480000
3)67 × 21 +18 × 21 + 85 × 79
=21×(67+18)+85×79
=21×85+85×79
=85×(21+79)
=8500
4)13 × 99
=13×(100-1)
=1300-13
=1287
5)75000 ÷ 125 ÷ 15
=75×1000÷125÷15
=75÷15×1000÷125
=5×8
=40