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简介:
3.5×99+3.5
=3.5×(99+1)
=3.5×100
=350
(乘法分配律) 3.5×101-3.5
=3.5×(101-1)
=3.5×100
=350
(乘法分配律)
3.5×2.7-3.5×0.7
=3.5×(2.7-0.7)
=3.5×2
=7
(乘法分配律) ★(32+5.6)÷0.8
=32÷0.8+5.6÷0.8
=40+7
=47
(类似分配律)
3.29+0.73+2.27
=3.29+(0.73+2.27)
=3.29+3
=6.29
(加法结合律) 3.29-0.73-2.27
=3.29-(0.73+2.27)
=3.29-3
=0.29
(减法的性质)