42-56+33-(33-56+42)

=42-56+33-33+56-42

=0

54-(45-30+54)-30+5

=54-45+30-54-30+5

=-40

\(=0\)

\(=-40\)

Hk tốt

\(=0\)

\(=-40\)

Hk tốt

wow! mù mắt. Ido tính toán có khác!

C2:(32+1)x32:2=528

bạn tính thử xem đúng đấy.

wowwowwow

1: =66+34-73-27+99=99

2: =54-45+30-54-30+5=-40

3: =42-56+33-33+56-42=0

4: =50-47-50+18+47-18=0

5: =10-28+30-4=2-4+10=12-4=8

\(\text{1.-(-66)+34+(-73)-27+99}.\)

\(=66+34-73-27+99=100-100+99=-99.\)

\(\text{2.54-(45-30+54)-30+5}.\)

\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)

\(\text{3.42-56+33-(33-56+42)}.\)

\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)

\(\text{4.50-(47+50-18)+(47-18)}.\)

\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)

\(\text{5.10-(28-30+4)}.\)

\(=10-28+30-4=10+30-20-8-4=20-12=8.\)

\(\text{6.-(-73)+(44-94+27)+94}.\)

\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)

\(\frac{7}{4}\)x(\(\frac{33}{12}\)+\(\frac{33}{20}\)+\(\frac{33}{30}\)+\(\frac{33}{42}\))

=\(\frac{7}{4}\)x\(\frac{44}{7}\)

=\(\frac{308}{28}\)=11

D

D

d?

    \(\left[27\cdot\left(-67\right)+33\cdot\left(-27\right)\right]:\left(-30\right)\)
⇔\(\left[27\cdot\left(-67\right)+\left(-33\right)\cdot27\right]:\left(-30\right)\)
⇔\(\left\{27\left[\left(-67\right)+\left(-33\right)\right]\right\}:\left(-30\right)\)
\(=\left\{27\cdot\left(-100\right)\right\}:\left(-30\right)\)
\(=\left(-2700\right):\left(-30\right)\)
\(=900\)

\(PeaGea\)

3

30 laughing - slipping

31 locking

32 to wait

33 run