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Q:
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A: =+ =(+) = = Q: 怎么简便计算 () ？ ？
A:() =+ =+ = = Q: 56乘57加43乘56怎么简便做 ？
A:原式=56×57+43×56=56×(57+43)=56×100=5600 利用乘法分配率的逆运算 Q: *+请列式计算 ？
A:*+ =*()+ =**+ =*2-()* =* = = Q: 1,3,7,13,21,31,43,57,? ？
A:1+2=3 3+4=7 7+6=13 13+8+21 ？.. 57+16 = 73 Q: 7/6+13/12+21/20+31/30+43/42+57/56 ？
A:7/6+13/12+21/20+31/30+43/42+57/56 =1+1/6+1+1/12+1+1/20+1+1/30+1+1/42+1+1/56 =6+1/(2X3)+1/(3X4)+1/(4X5)+1/(5X6)+1/(6X7)+1/(7X8) =6+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8 =6+1/2-1/8 =6+3/8 =51/8 Q: 57²+43*46-11*57怎么因式分解 ？
A:57²+43*46-11*57 =57(57-11)+43*46 =57*46+43*46 =46*(57+43) =46*100 =4600
A: =+ =(+) = = Q: 怎么简便计算 () ？ ？
A:() =+ =+ = = Q: 56乘57加43乘56怎么简便做 ？
A:原式=56×57+43×56=56×(57+43)=56×100=5600 利用乘法分配率的逆运算 Q: *+请列式计算 ？
A:*+ =*()+ =**+ =*2-()* =* = = Q: 1,3,7,13,21,31,43,57,? ？
A:1+2=3 3+4=7 7+6=13 13+8+21 ？.. 57+16 = 73 Q: 7/6+13/12+21/20+31/30+43/42+57/56 ？
A:7/6+13/12+21/20+31/30+43/42+57/56 =1+1/6+1+1/12+1+1/20+1+1/30+1+1/42+1+1/56 =6+1/(2X3)+1/(3X4)+1/(4X5)+1/(5X6)+1/(6X7)+1/(7X8) =6+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8 =6+1/2-1/8 =6+3/8 =51/8 Q: 57²+43*46-11*57怎么因式分解 ？
A:57²+43*46-11*57 =57(57-11)+43*46 =57*46+43*46 =46*(57+43) =46*100 =4600
