题目内容
| 用简便方法计算 ①2.6+6.92+3.4+0.08 | ②3200÷4÷5 | ③8.8-4.3-3.7 |
| ④312×4+188×4 | ⑤32×125×25 | ⑥2.43-(0.28+1.43) |
①2.6+6.92+3.4+0.08,
=(2.6+3.4)+(6.92+0.08),
=6+7,
=13;
②3200÷4÷5,
=3200÷(4×5),
=3200÷20,
=160;
③8.8-4.3-3.7,
=8.8-(4.3+3.7),
=8.8-8,
=0.8;
④312×4+188×4,
=4×(312+188),
=4×500,
=2000;
⑤32×125×25,
=(4×25)×(125×8),
=100×1000,
=100000;
⑥2.43-(0.28+1.43),
=2.43-1.43-0.28,
=1-0.28,
=0.72.
=(2.6+3.4)+(6.92+0.08),
=6+7,
=13;
②3200÷4÷5,
=3200÷(4×5),
=3200÷20,
=160;
③8.8-4.3-3.7,
=8.8-(4.3+3.7),
=8.8-8,
=0.8;
④312×4+188×4,
=4×(312+188),
=4×500,
=2000;
⑤32×125×25,
=(4×25)×(125×8),
=100×1000,
=100000;
⑥2.43-(0.28+1.43),
=2.43-1.43-0.28,
=1-0.28,
=0.72.
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