题目内容
| 脱式计算: 304×8 | 179×24 | 602×91 |
| [236-(143+47)]×2 | 15×(420÷28+12) |
(1)304×8,
=(300+4)×8,
=300×8+4×8,
=2400+32,
=2432;
(2)179×24,
=(180-1)×24,
=180×24-1×24,
=4320-24,
=4296;
(3)602×91,
=(600+2)×91,
=600×91+2×91,
=54600+182,
=54782;
(4)[236-(143+47)]×2,
=[236-190]×2,
=46×2,
=92;
(5)15×(420÷28+12),
=15×(15+12),
=15×27,
=405.
=(300+4)×8,
=300×8+4×8,
=2400+32,
=2432;
(2)179×24,
=(180-1)×24,
=180×24-1×24,
=4320-24,
=4296;
(3)602×91,
=(600+2)×91,
=600×91+2×91,
=54600+182,
=54782;
(4)[236-(143+47)]×2,
=[236-190]×2,
=46×2,
=92;
(5)15×(420÷28+12),
=15×(15+12),
=15×27,
=405.
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