题目内容
| 用简便方法计算. 7100-137-263+300 | 438+126+162+74 | 6×(8×7)×125 | 25×18×4×2. |
(1)7100-137-263+300
=7100-(137+263)+300
=7100-400+300
=7000;
(2)438+126+162+74
=(438+162)+(126+74)
=600+200
=800;
(3)6×(8×7)×125
=6×7×(8×125)
=42×1000
=42000;
(4)25×18×4×2
=(25×4)×(18×2)
=100×36
=3600.
=7100-(137+263)+300
=7100-400+300
=7000;
(2)438+126+162+74
=(438+162)+(126+74)
=600+200
=800;
(3)6×(8×7)×125
=6×7×(8×125)
=42×1000
=42000;
(4)25×18×4×2
=(25×4)×(18×2)
=100×36
=3600.
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