7/15乘57加33除以15/7简便,运算怎么做?
7/15乘57加33除以15/7简便,运算怎么做?
7/15×57+33÷15/7
=7/15×57+33×7/15
=7/15×(57+33)
=7/15×90
=42
8/15乘7/17加7/15乘9/17简便运算
8/15*7/17+7/15*9/17
=8/17*7/15+7/15*9/17
=(8/17+9/17)*7/15
=1*7/15
=7/15
7/28*15/8+ 7/8*13/28 简便运算
7/28×15/8+7/8×13/28
=7/8×15/28+7/8×13/28
=7/8×(15/28+13/28)
=7/8×1
=7/8
怎样简便就怎样算。7/15×57+33÷15/7。和1÷(15-12/5-13/5)
7/15×57+33÷15/7
=7/15x57+33x7/15
=7/15x(57+33)
=7/15x90
=42
1÷(15-12/5-13/5)
=1÷[15-(12/5+13/5)]
=1÷(15-5)
=1÷10
=1/10
4/15乘7加上7/15乘以11的简便运算怎么想做了?
4/15 x 7 +7/15 x11
=7/15 x4 +7/15 x11
=7/15 x(4+11)
=7/15 x15
=7
15/2乘5/9+4/7+11/5除以6/5(简便运算)
15/2乘5/9+4/7+11/5除以6/5
=75/18+4/7+11/5*5/6
=75/18+4/7+11/6
=108/18+4/7
=6+4/7
=6又4/7
9/4除以5/9加25/21乘以7/15的和的简便运算
9/4÷(5/9+25/21×7/15)
=9/4÷(5/9+5/9)
=9/4÷10/9
=81/40
7/12-7/15加8/15简便运算
7/12-7/15加8/15简便运算
7/12-7/15加8/15
=7/12+(8/15-7/15)
=7/12+1/15
=35/60+4/60
=39/60
15×13×4/13 7/15的和简便运算怎么做
15×13×4/13 7/15的和简便运算怎么做
15×13×4/13 7/15
=15*13*(4/13+7/15)
=15*13*4/13+13*15*7/15
=60+91
=151
求助!简便运算题:(7/28)*(15/8)+(13/28)*(7/8)
(7/28)*(15/8)+(13/28)*(7/8)
=7/(28*8)×(15+13)
=7*28/(28*8)
=7/8