题目内容
递等式计算,能巧算的要巧算:
| 3h×h5×1h5 | 38图+196+h16+1j图 | 8×(1h5+h5)×图 |
| hj7j÷[(18j图-h7图)÷17] | 78×57-78+78×图3 | 831-(h3×图j-1h6) |
(1)g2×2七×12七,
=8×4×2七×12七,
=(4×2七)×(12七×8),
=100×1000,
=100000;
(2)g84+190+210+104,
=(g84+210)+(190+104),
=000+g00,
=900;
(g)8×(12七+2七)×4,
=12七×8×4+2七×4×8,
=4000+800,
=4800;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;
&gbsp;
(4)2070÷[(1804-274)÷17],
=2070÷[1七g0÷17],
=2070÷90,
=2g;
(七)78×七7-78+78×4g,
=78×(七7+4g-1),
=78×(100-1)
=78×100-78×1,
=7800-78,
=7722;
(0)8g1-(2g×40-120),
=8g1-(920-120),
=8g1-794,
=g7.
=8×4×2七×12七,
=(4×2七)×(12七×8),
=100×1000,
=100000;
(2)g84+190+210+104,
=(g84+210)+(190+104),
=000+g00,
=900;
(g)8×(12七+2七)×4,
=12七×8×4+2七×4×8,
=4000+800,
=4800;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;&gbsp;
&gbsp;
(4)2070÷[(1804-274)÷17],
=2070÷[1七g0÷17],
=2070÷90,
=2g;
(七)78×七7-78+78×4g,
=78×(七7+4g-1),
=78×(100-1)
=78×100-78×1,
=7800-78,
=7722;
(0)8g1-(2g×40-120),
=8g1-(920-120),
=8g1-794,
=g7.
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