能简算的要简算（11分之2乘0.87+0.13*11分之2)\5%（2）（13分之4+15分之7）*13*15

能简算的要简算（11分之2乘0.87+0.13*11分之2)\5%（2）（13分之4+15分之7）*13*15

（11分之2乘0.87+0.13*11分之2)\5%
=2/11*(0.87+0.13)*20
=2/11*1*20
=40/11
(13分之4+15分之7）*13*15
=4/13*13*15+7/15*13*15
=4*15+7*13
=60+91
=151
7X+3*0.5=23.7
7x=23.7-1.5
7x=22.2
x=222/10*1/7
x=222/7
6X除以2=210
6x=210*2
6x=420
x=420/6
x=70
0.8:9分之4
=4/5:4/9
=4/5*9/4
=9/5
=1.8

(2/11×0.87+0.13×2/11)÷5%
=2/11×(0.87+0.13)÷5%
=2/11×1×20
=40/11
(4/13+7/15)×13×15
=4/13×13×15+7/15×13×15
=4×15+7×13
=60+91
=151求未知数X的值（1）7X+3*0.5=23.7(2)6X除以2=210 求比值和化...

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(2/11×0.87+0.13×2/11)÷5%
=2/11×(0.87+0.13)÷5%
=2/11×1×20
=40/11
(4/13+7/15)×13×15
=4/13×13×15+7/15×13×15
=4×15+7×13
=60+91
=151

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