题目内容
| 计算,能间算的要间算. 12.36-6.49-3.51 | 8.5×3.8+8.5×6.2 |
| 0.25×12.5×3.2 | 102×0.45. |
(1)12.36-6.49-3.51,
=12.36-(6.49+3.51),
=12.36-10,
=2.36;
(2)8.5×3.8+8.5×6.2,
=8.5×(3.8+6.2),
=8.5×10,
=85;
(3)0.25×12.5×3.2,
=0.25×12.5×4×0.8,
=(0.25×4)×(12.5×0.8),
=1×10,
=10;
(4)102×0.45,
=(100+2)×0.45,
=100×0.45+2×0.45,
=45+0.9,
=45.9.
=12.36-(6.49+3.51),
=12.36-10,
=2.36;
(2)8.5×3.8+8.5×6.2,
=8.5×(3.8+6.2),
=8.5×10,
=85;
(3)0.25×12.5×3.2,
=0.25×12.5×4×0.8,
=(0.25×4)×(12.5×0.8),
=1×10,
=10;
(4)102×0.45,
=(100+2)×0.45,
=100×0.45+2×0.45,
=45+0.9,
=45.9.
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