3×(x+4)=12;5÷(x+16.84)=1/5(五分之一);x-3/5x=8/15;x÷7/5=8/7;3/4x+1/2=7/12

问题描述:

3×(x+4)=12;5÷(x+16.84)=1/5(五分之一);x-3/5x=8/15;x÷7/5=8/7;3/4x+1/2=7/12

3×(x+4)=12x+4=12÷3x+4=4x=4-4x=05÷(x+16.84)=1/5(五分之一)x+16.84=5×5x+16.84=25x=25-16.84x=8.16x-3/5x=8/15都乘15,得:15x-9x=86x=8x=8/6x=4/3x÷7/5=8/7x=8/7×7/5x=8/53/4x+1/2=7/12 都乘12,得:9x+6=...