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简介:
35×40.2
=35×(40+0.2)
=35×40+35×0.2
=1400+7
=1407(乘法分配律)
3.5×99+3.5
=3.5×99+3.5×1
=3.5×(99+1)
=3.5×100
=350(乘法分配律)
3.5×9.9+3.5×0.1
=3.5×(9.9+0.1)
=3.5×10
=35(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)
3.5×9.9
=3.5×(10-0.1)
=3.5×10-3.5×0.1
=35-0.35
=34.65(乘法分配律)
3.5×2.7+35×0.73
=3.5×2.7+3.5×7.3
=3.5×(2.7+7.3)
=3.5×10
=35(乘法分配律)
4.9÷3.5
=4.9÷(0.7×5)
=4.9÷0.7:5
=7÷5
=1.4(除法性质)
7.35÷(7.35÷0.25)
=7.35÷7.35×0.25
=1×0.25
=0.25(除法性质)