题目内容
脱式计算.
3.6×10.1 | 5.2×(4.7-1.9) | 0.98+4.3×1.25. |
分析:(1)把10.1分成10+0.1,然后再根据乘法分配律进行计算;
(2)先算减法,再算乘法;
(3)先算乘法,再算加法.
(2)先算减法,再算乘法;
(3)先算乘法,再算加法.
解答:解:
(1)3.6×10.1,
=3.6×(10+0.1),
=3.6×10+3.6×0.1,
=36+0.36,
=36.36;
(2)5.2×(4.7-1.9),
=5.2×2.8,
=14.56;
(3)0.98+4.3×1.25,
=0.98+5.375,
=6.355.
(1)3.6×10.1,
=3.6×(10+0.1),
=3.6×10+3.6×0.1,
=36+0.36,
=36.36;
(2)5.2×(4.7-1.9),
=5.2×2.8,
=14.56;
(3)0.98+4.3×1.25,
=0.98+5.375,
=6.355.
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律简便计算.
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