基础园地
1、(1)(a+b)×c=a×c+b×c
(2)乘法分配 乘法结合
(3)6÷[3/2×(3/5-1/10)]=8
2、
=8.5-10.4÷1.3 =8.5-8 =0.5 |
=3/4-1/10 =(15-2)/20 =13/20 |
=[(10+3-6)/12]×12 =(7/12)×12 =7 |
=4×(5/4)×5 =25 |
=2/5×(23+27) =(2/5)×50 =20 |
=4/29×(1-3/4-3/8) =(4/29)×[(8 -6+3)/8] =5/58 |
=8×1.25×35.7 =10×35.7=357 |
=4.7×99+4.7 =4.7×100=470 |
=1/7×(5/13+9/13) =(1/7)×(14/13) =2/13 |
=8/15+7/15)-(0.64+0.36) =1-1 =0 |
4、(63+56)×5/7=105km 63×5/7+56×5/7=105km
5、56×1.5÷(1.5-0.3)=70(台)
拓展空间
350÷7+14÷7