题目内容
计算,能简算的要简算.
24×(0.5+0.05) | 1.83×2.6+7.4×1.83 | 4.8×0.25×4 |
9.07-22.78÷3.4 | 5.2×10.1 | 3.76×0.25+9.06. |
分析:(1)(2)运用乘法分配律简算;
(3)运用乘法结合律简算;
(4)先算除法,再算减法;
(5)把10.1看作10+0.1,运用乘法分配律简算;
(6)先算乘法,再算加法.
(3)运用乘法结合律简算;
(4)先算除法,再算减法;
(5)把10.1看作10+0.1,运用乘法分配律简算;
(6)先算乘法,再算加法.
解答:解:(1)24×(0.5+0.05),
=24×0.5+24×0.05,
=12+1.2,
=13.2;
(2)1.83×2.6+7.4×1.83,
=1.83×(2.6+7.4),
=1.83×10,
=18.3;
(3)4.8×0.25×4,
=4.8×(0.25×4),
=4.8×1,
=4.8;
(4)9.07-22.78÷3.4,
=9.07-6.7,
=2.37;
(5)5.2×10.1,
=5.2×(10+0.1),
=52+0.52,
=52.52;
(6)3.76×0.25+9.06,
=0.94+9.06,
=10.
=24×0.5+24×0.05,
=12+1.2,
=13.2;
(2)1.83×2.6+7.4×1.83,
=1.83×(2.6+7.4),
=1.83×10,
=18.3;
(3)4.8×0.25×4,
=4.8×(0.25×4),
=4.8×1,
=4.8;
(4)9.07-22.78÷3.4,
=9.07-6.7,
=2.37;
(5)5.2×10.1,
=5.2×(10+0.1),
=52+0.52,
=52.52;
(6)3.76×0.25+9.06,
=0.94+9.06,
=10.
点评:此题考查了小数的四则混合运算,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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