Tính nhanh
91 x 51 + 49 x 163 - 49 x 72
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`@` `\text {Ans}`
`\downarrow`
`2023 \times 14 + 2023 \times 83+97`
`= 2023 \times (14+83) + 97`
`= 2023 \times 97 + 97`
`= 196231 +97`
`= 196328`
`78 \times 31+78 \times 24+78 \times 17+78 \times 22 \times 72`
`= 78 \times (31+24+17+22 \times 72)`
`= 78 \times (31+24+17+1584)`
`= 78 \times 1656`
`= 129168`
`371 \times 69+371 \times 14+629 \times 83`
`= 371 \times (69+14) + 629 \times 83`
`= 371 \times 83 + 629 \times 83`
`= 83 \times (371+629)`
`= 83 \times 1000`
`= 83000`
`91 \times 51+49 \times 163-49 \times 72`
`= 91 \times 51 + 49 \times (163-72)`
`= 91 \times 51+49 \times 91`
`= 91 \times (51+49)`
`= 91 \times 100`
`= 9100`
`3 \times 12 \times 17 + 4 \times 9 \times 81 + 2 \times 6 \times 6`
`= 9 \times 4 \times 17 + 4 \times 9 \times 81 + 4 \times 9 \times 2`
`= 9 \times 4 \times (17+81+2)`
`= 36 \times 100`
`= 3600`
`42 \times 17 + 58 \times 83 \times 42 \times 83 + 42 \times 83 + 17`
`= 17 \times (42+58) + 42 \times 83 \times (58 \times 83 +1)`
`= 17 \times 100 + 3486 \times 4815`
`= 1700 + 16785090`
`= 16786790`
\(91.51+49.163+49.72\)
\(=91.51+49.\left(163+72\right)\)
\(=91.51+49.235\)
\(=4641+11515\)
\(=16156\)
81 x 51 + 49 x 153 - 49 x 72
= 49 x 2 x 51 + 49 x 153 - 49 x 72
= 49 x 102 + 49 x 153 - 49 x 72
= 49 x ( 102 + 153 - 72 )
= 49 x 183
= 8967
a: \(=81\cdot51+49\cdot81=81\cdot100=8100\)
b: \(=371\left(65+25+10\right)=37100\)
a,81*51+49*153-49*72
= 81*51+49*(153-72)
=81*51+49*81
=81*(51+49)
=81*100
=8100
35 \(\times\) 49 + 51 \(\times\) 36
= 35 \(\times\) 49 + 51 \(\)\(\times\) (35 + 1)
= 35 \(\times\) 49 + 35 \(\times\) 51 + 51
= (35 \(\times\) 49 + 35 \(\times\) 51) + 51
= 35 \(\times\)( 49 + 51) + 51
= 35 \(\times\) 100 + 51
= 3500 + 51
= 3551
a: x-56:4=16
nên x-14=16
hay x=30
b: \(101+\left(36-4x\right)=105\)
\(\Leftrightarrow36-4x=4\)
hay x=8
Vì a: x-56:4=16
=>x-14=16
Hay:x=30
Vì b: 101+(36−4x)=105101+(36−4x)=105
⇔36−4x=4⇔36−4x=4
Hay:x=8
Vậy x={30:8}
Nếu sai thì thui nhá,đừng chửi mình!
35 x 49 + 51 x 36 = 35 x 49 + 51 x ( 35+1) =35 x 49 + 51 x 35 + 51 = 35 x ( 49 + 51 ) + 51 = 35 x 100 + 51 = 3500+51 = 3551
91 x 51 + 49 x 163 - 49 x 72
= 91 x 51 + 49 x ( 163 - 72 )
= 91 x 51 + 49 x 91
= 91 x ( 51 + 49 )
= 91 x 100
= 9100
91x51 + 49x163-49x72
=91x51+49x( 163-72)
=91x51+49x91
=91x(51+49)
=91x100
=9100