题目内容
计算下面各题,能简便计算的用简便方法计算 9.4×2.8-11.5 |
4.5×1.01 |
57.4×3.66-57.4×1.66 | 3.3÷0.25÷4 |
0.648÷[(0.4+0.5)×0.6] | 6.28-(1.28+2.18) |
分析:(1)先算乘法,再算减法;
(2)把101看作1+0.01,运用乘法分配律简算;
(3)运用乘法分配律简算;
(4)运用除法的性质简算;
(5)先算小括号内的,再算中括号内的,最后算括号外的;
(6)运用减法的性质简算.
(2)把101看作1+0.01,运用乘法分配律简算;
(3)运用乘法分配律简算;
(4)运用除法的性质简算;
(5)先算小括号内的,再算中括号内的,最后算括号外的;
(6)运用减法的性质简算.
解答:解:(1)9.4×2.8-11.5
=26.32-11.5
=14.82
(2)4.5×1.01
=4.5×(1+0.01)
=4.5+4.5×0.01
=4.5+0.045
=4.545
(3)57.4×3.66-57.4×1.66
=57.4×(3.66-1.66)
=57.4×2
=114.8
(4)3.3÷0.25÷4
=3.3÷(0.25×4)
=3.3÷1
=3.3
(5)0.648÷[(0.4+0.5)×0.6]
=0.648÷[0.9×0.6]
=0.648÷0.54
=1.2
(6)6.28-(1.28+2.18)
=6.28-1.28-2.18
=5-2.18
=2.82
=26.32-11.5
=14.82
(2)4.5×1.01
=4.5×(1+0.01)
=4.5+4.5×0.01
=4.5+0.045
=4.545
(3)57.4×3.66-57.4×1.66
=57.4×(3.66-1.66)
=57.4×2
=114.8
(4)3.3÷0.25÷4
=3.3÷(0.25×4)
=3.3÷1
=3.3
(5)0.648÷[(0.4+0.5)×0.6]
=0.648÷[0.9×0.6]
=0.648÷0.54
=1.2
(6)6.28-(1.28+2.18)
=6.28-1.28-2.18
=5-2.18
=2.82
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定律或性质简便计算.
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