题目内容
脱式计算(能简算的要简算)
0.75×4×0.25 | 50+10×99 | 16÷8-0.72 |
4.536÷0.8÷14 | 3×3.6+1.4×10 | 6.3×11. |
分析:(1)运用乘法结合律简算;
(2)先算乘法,再算加法;
(3)先算除法,再算减法;
(4)按照从左到右的顺序计算;
(5)先算同时运算乘法,再算加法;
(6)先把11分解成10+1,再运用乘法分配律简算.
(2)先算乘法,再算加法;
(3)先算除法,再算减法;
(4)按照从左到右的顺序计算;
(5)先算同时运算乘法,再算加法;
(6)先把11分解成10+1,再运用乘法分配律简算.
解答:解:(1)0.75×4×0.25,
=0.75×(4×0.25),
=0.75×1,
=0.75;
(2)50+10×99,
=50+990,
=1040;
(3)16÷8-0.72,
=2-0.72,
=1.23;
(4)4.536÷0.8÷14,
=5.67÷14,
=0.405;
(5)3×3.6+1.4×10,
=10.8+14,
=24.8;
(6)6.3×11,
=6.3×(10+1),
=6.3×10+6.3×1,
=63+6.3,
=69.3.
=0.75×(4×0.25),
=0.75×1,
=0.75;
(2)50+10×99,
=50+990,
=1040;
(3)16÷8-0.72,
=2-0.72,
=1.23;
(4)4.536÷0.8÷14,
=5.67÷14,
=0.405;
(5)3×3.6+1.4×10,
=10.8+14,
=24.8;
(6)6.3×11,
=6.3×(10+1),
=6.3×10+6.3×1,
=63+6.3,
=69.3.
点评:本题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进行简便计算.
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