混合运算 (你能用简便方法计算吗?) 1.39+0.72+0.61+3.2817.8-3.7-6.38.2
混合运算(你能用简便方法计算吗?)1.39+0.72+0.61+3.2817.8-3.7-6.38.28-(1.28+3.7)...
混合运算 (你能用简便方法计算吗?) 1.39+0.72+0.61+3.2817.8-3.7-6.38.28-(1.28+3.7)
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(1)1.39+0.72+0.61+3.28
=(1.39+0.61)+(0.72+3.28)
=2+4
=6
(2)17.8-3.7-6.3
=17.8-(3.7+6.3)
=17.8-10
=7.8
(3)8.28-(1.28+3.7)
=8.28-1.28-3.7
=7-3.7
=3.3
=(1.39+0.61)+(0.72+3.28)
=2+4
=6
(2)17.8-3.7-6.3
=17.8-(3.7+6.3)
=17.8-10
=7.8
(3)8.28-(1.28+3.7)
=8.28-1.28-3.7
=7-3.7
=3.3
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