题目内容
脱式计算数我棒.
12.8+2.04×9.5
0.6×(4.2-0.8)-0.45
3.2×1.4+5.62
51.8-4.8×(2.03-0.18)
12.8+2.04×9.5
0.6×(4.2-0.8)-0.45
3.2×1.4+5.62
51.8-4.8×(2.03-0.18)
分析:根据小数四则混合运算的运算顺序:先算乘除、后算加减,有括号的先算括号的;据此依次进行解答即可.
解答:解:12.8+2.04×9.5
=12.8+19.38
=32.18
0.6×(4.2-0.8)-0.45
=0.6×3.4-0.45
=2.04-0.45
=1.59
3.2×1.4+5.62
=4.48+5.62
=10.1
51.8-4.8×(2.03-0.18)
=51.8-4.8×1.85
=51.8-8.88
=42.92.
=12.8+19.38
=32.18
0.6×(4.2-0.8)-0.45
=0.6×3.4-0.45
=2.04-0.45
=1.59
3.2×1.4+5.62
=4.48+5.62
=10.1
51.8-4.8×(2.03-0.18)
=51.8-4.8×1.85
=51.8-8.88
=42.92.
点评:此题主要考查小数的四则混合运算的运算顺序,然后再进一步计算.
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