题目内容
脱式计算. ①8.82×15-100 |
②15.8-
|
③21.6-0.8×4÷0.8×4 | ||||
④3×3.7+3.6+5.3×3 | ⑤5+0.45÷0.9-1.75 | ⑥1110÷[56×(
|
分析:①按运算顺序计算,先算乘法,再算减法;
②运用加法交换律与结合律以及减法的性质简算;
③按运算顺序计算,先算0.8×4÷0.8×4,按运算顺序从左向右依次计算,最后算减法;
④运用乘法分配律简算;
⑤按运算顺序计算,先算除法,再按顺序从左向右依次计算;
⑥中括号内运用乘法分配律简算.
②运用加法交换律与结合律以及减法的性质简算;
③按运算顺序计算,先算0.8×4÷0.8×4,按运算顺序从左向右依次计算,最后算减法;
④运用乘法分配律简算;
⑤按运算顺序计算,先算除法,再按顺序从左向右依次计算;
⑥中括号内运用乘法分配律简算.
解答:解:①8.82×15-100,
=132.3-100,
=32.3;
②15.8-
+14.2-
,
=(15.8+14.2)-(
+
),
=30-1,
=29;
③21.6-0.8×4÷0.8×4,
=21.6-3.2÷0.8×4,
=21.6-16,
=5.6;
④3×3.7+3.6+5.3×3,
=(3.7+5.3)×3+3.6,
=9×3+3.6,
=27+3.6,
=30.6;
⑤5+0.45÷0.9-1.75,
=5+0.5-1.75,
=5.5-1.75,
=3.75;
⑥1110÷[56×(
-
)],
=1110÷[56×
-56×
],
=1110÷[24-21],
=1110÷3,
=370.
=132.3-100,
=32.3;
②15.8-
7 |
18 |
11 |
18 |
=(15.8+14.2)-(
7 |
18 |
11 |
18 |
=30-1,
=29;
③21.6-0.8×4÷0.8×4,
=21.6-3.2÷0.8×4,
=21.6-16,
=5.6;
④3×3.7+3.6+5.3×3,
=(3.7+5.3)×3+3.6,
=9×3+3.6,
=27+3.6,
=30.6;
⑤5+0.45÷0.9-1.75,
=5+0.5-1.75,
=5.5-1.75,
=3.75;
⑥1110÷[56×(
3 |
7 |
3 |
8 |
=1110÷[56×
3 |
7 |
3 |
8 |
=1110÷[24-21],
=1110÷3,
=370.
点评:考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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