题目内容
用简便方法计算.
①54.38+(19.5-4.38)
②25×32×7
③8×
+8×
+8
③756+199.
①54.38+(19.5-4.38)
②25×32×7
③8×
| 3 |
| 5 |
| 2 |
| 5 |
③756+199.
①54.38+(19.5-4.38),
=54.38+19.5-4.38,
=(54.38-4.38)+19.5,
=50+19.5,
=69.5;
②25×32×7,
=25×4×8×7,
=(25×4)×(8×7),
=100×56,
=5600;
③8×
+8×
+8,
=(
+
+1)×8,
=2×8,
=16;
④756+199,
=700+56+(200-1),
=700+200+(56-1),
=900+55,
=955.
=54.38+19.5-4.38,
=(54.38-4.38)+19.5,
=50+19.5,
=69.5;
②25×32×7,
=25×4×8×7,
=(25×4)×(8×7),
=100×56,
=5600;
③8×
| 3 |
| 5 |
| 2 |
| 5 |
=(
| 3 |
| 5 |
| 2 |
| 5 |
=2×8,
=16;
④756+199,
=700+56+(200-1),
=700+200+(56-1),
=900+55,
=955.
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