a) 85 + 11 × 305 = 85 + 3355

= 3440

b) 85 × 11 + 305 = 935 + 305

= 1240

85+11*305

=85+3355

=3440

85 + 11 x 305

= 85 + 3355

= 3440

      85 + 11 x 305 = 85 + 3355

                            = 3440

                 Chúc bn hok tốt

b: \(305+\left(-105\right)+\left(-246\right)+546\)

\(=200+300\)

=500

c: \(435+\left(-43\right)+\left(-483\right)+\left(-57\right)+383+\left(-415\right)\)

\(=20-100-100\)

=-180

d: \(1316+317+\left(-1216\right)+\left(-315\right)+\left(-85\right)\)

\(=100-2-85\)

=13

a,= (45-35)+(-28+27+11)-6=10+10-6=14

b,=(305-105)+(-246+546)=200+300=500

c,= (435-415)+(-43-57)+(-483+383)=20-100-100=-180

d,=(1316-1216)+(317-315-85)= 100-83= 17

A   \(\frac{2}{3}+y=\frac{11}{12}.5\)

\(\Rightarrow\frac{2}{3}+y=\frac{55}{12}\)

\(\Rightarrow y=\frac{55}{12}-\frac{2}{3}\)

\(\Rightarrow y=\frac{55}{12}-\frac{8}{12}\)

\(\Rightarrow y=\frac{47}{12}\)

305+305.99=305.100=30500

Cảm ơn Trung Hoàng nhằm tiếc là mik k k cho bạn đc để ngày mai nhá vì mik k bạn hơn 3 lần r.

\(41\times36+59\times90+41\times84+59\times30=41\times\left(36+84\right)+59\times\left(90+30\right)=41\times120+59\times120=120\times\left(41+59\right)=120\times100=12000\)

\(4\times51\times7+2\times86\times7+12\times2\times7=4\times7\times\left(51+43+6\right)=28\times100=2800\)

\(87+35+13=100+35=135\)

\(62+34+66=62+100=162\)

\(212+109+188=400+109=509\)

\(305+195+110=500+110=610\)

\(15+46+85+54=100+100=200\)

\(277+144+86+123=400+230=630\)

93437

=93437

303 x 306 + 610/305 x 207 + 305

= 92718 + 2 x 207 + 305

= 92718 + 414 + 305

= 93131 + 305 

= 93437

305 x 207 + 305

305 x 207 + 305 x 1

305 x (207 + 1 )

305 x 208

=63440

còn câu a mik ko bít

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