Dạng 2: Tính giá trị biểu thức có đáp án

$a)\left(33,7-31,5\right)+\left(57,6-55,4\right)=2,2+2,2=4,4$

$b)\left(85,5+4,5\right)-\left(12,02+7,98\right)=90-20=70$

$c)\left(15,25+3,75\right).4+\left(20,71+5,29\right).5=19.4+26.5=76+130=206$

$d)\left(34,72+32,28\right):5-\left(57,25-36,05\right):2$$=67:5+21,2:2$

$=13,4-10,6=2,8$

$b)1999,1999+2001,2001=4000,4$

$b)B=123,8-34,15-12,49-\left(5,85-2,49\right)+10,2$

$=\left(123,8+10,2\right)-(34,15+5,85)-(12,49-2,49)$

$=134-40-10=84$

$c)C=32,18+36,42+13,93-\left(2,18+6,42+3,93\right)$

$=32,18+36,42+13,93-2,18-6,42-3,93$

$=(32,18-2,18)+(36,42-6,42)+(13,93-3,93)$$=30+30+10=70$

$d)D=49,358-32,16+39,452-9,358+2,16+0,548$

$=(49,358-9,358)-(32,16-2,16)+(39,452+0,548)$

$=40-30+40=50$

$e)E=172,56-35,32-72,56+4,37-(5,37-5,32)$

$=172,56-35,32-72,56+4,37-5,37+5,32$

$=(172,56-72,56)-(35,32-5,32)-(5,37-4,37)$

$=100-30-1=69$

$f)F=3.\left(32,1-6,32\right)+7.32,1+3.0,32$

$=3.32,1-3.6,32+7.32,1+3.0,32$

$=(3.32,1+7.32,1)-(3.6,32-3.0,32)$

$=32,1.(3+7)-3.(6,32-0,32)$

$=32,1.10-3.3$

$=321-9=312$