题目内容
脱式计算
①36÷0.2×1.6 | ②1.9×3.6+3.6×0.1 | ③5.1+34.1÷2.2 |
④0.21×99+0.21 | ⑤3.76×0.25+25.8 | ⑥50.4×1.9-1.8. |
考点:小数四则混合运算,运算定律与简便运算
专题:运算顺序及法则
分析:①按照从左向右的顺序进行计算;
②根据乘法分配律进行简算;
③先算除法,再算加法;
④根据乘法分配律进行简算;
⑤先算乘法,再算加法;
⑥先算乘法,再算减法.
②根据乘法分配律进行简算;
③先算除法,再算加法;
④根据乘法分配律进行简算;
⑤先算乘法,再算加法;
⑥先算乘法,再算减法.
解答:
解:①36÷0.2×1.6
=180×1.6
=288;
②1.9×3.6+3.6×0.1
=(1.9+0.1)×3.6
=2×3.6
=7.2;
③5.1+34.1÷2.2
=5.1+15.5
=20.6;
④0.21×99+0.21
=0.21×(99+1)
=0.21×100
=21;
⑤3.76×0.25+25.8
=0.94+25.8
=26.74;
⑥50.4×1.9-1.8
=95.76-1.8
=93.96.
=180×1.6
=288;
②1.9×3.6+3.6×0.1
=(1.9+0.1)×3.6
=2×3.6
=7.2;
③5.1+34.1÷2.2
=5.1+15.5
=20.6;
④0.21×99+0.21
=0.21×(99+1)
=0.21×100
=21;
⑤3.76×0.25+25.8
=0.94+25.8
=26.74;
⑥50.4×1.9-1.8
=95.76-1.8
=93.96.
点评:考查了运算定律与简便运算,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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