用递等式计算,能简算的要用简便方法计算?
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解题思路:(1)(4)(5)(6)从左往右依次运算.
(2)运用加法交换律与结合律简算.
(3)运用减法的性质简算.
(1)5.8-2.29+13.7
=3.51+13.7
=17.21;
(2)7.5+1.18+2.5+4.82
=(7.5+2.5)+(1.18+4.82)
=10+6
=16;
(3)50-6.85-3.15
=50-(6.85+3.15)
=50-10
=40;
(4)4.18+17.22+11.02
=21.4+11.02
=32.42;
(5)10-6.7-1.35
=3.3-1.35
=1.95;
(6)17.58-10.1+4.72
=7.48+4.72
=12.2.
,5,用递等式计算,能简算的要用简便方法计算
5.8-2.29+13.7 7.5+1.18+2.5+4.82 50-6.85-3.15 4.18+17.22+11.02 10-6.7-1.35 17.58-10.1+4.72.
(2)运用加法交换律与结合律简算.
(3)运用减法的性质简算.
(1)5.8-2.29+13.7
=3.51+13.7
=17.21;
(2)7.5+1.18+2.5+4.82
=(7.5+2.5)+(1.18+4.82)
=10+6
=16;
(3)50-6.85-3.15
=50-(6.85+3.15)
=50-10
=40;
(4)4.18+17.22+11.02
=21.4+11.02
=32.42;
(5)10-6.7-1.35
=3.3-1.35
=1.95;
(6)17.58-10.1+4.72
=7.48+4.72
=12.2.
,5,用递等式计算,能简算的要用简便方法计算
5.8-2.29+13.7 7.5+1.18+2.5+4.82 50-6.85-3.15 4.18+17.22+11.02 10-6.7-1.35 17.58-10.1+4.72.
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