Câu 4:
\(a,59.63+59.37=59\left(63+37\right)=59.100=5900\\ b,25.2^3-16:4^2=25.8-16:16=200-1=199\\ c,346+\left(-85\right)+\left(-346\right)+15=\left[346+\left(-346\right)\right]+\left(-85+15\right)=0+\left(-60\right)=-60\)\(d,17.34+17.66-1500=17\left(34+66\right)-1500=17.100-1500=1700-1500=200\\ e,\left(-37\right).129+37.29=37\left(-129\right)+37.29=37\left(-129+29\right)=37.\left(-100\right)=-3700\\ f,90:\left[53-\left(7-5\right)^3\right]=90:\left(53-2^3\right)=90:\left(53-8\right)=90:45=2\)
Câu 5:
\(a,\left(-5\right)+x=7\\ \Rightarrow x=7-\left(-5\right)\\ \Rightarrow x=12\\ b,x-17=-23\\ \Rightarrow x=-23+17\\ \Rightarrow x=-6\\ c,4\left(x-3\right)=28\\ \Rightarrow x-3=28:4\\ \Rightarrow x=7+3\\ \Rightarrow x=10\\ d,4\left(x+41\right)=400\\ \Rightarrow x+41=400:4\\ \Rightarrow x=100-41\\ \Rightarrow x=59\)
\(e,140:\left(x-8\right)=7\\ \Rightarrow x-8=140:7\\ \Rightarrow x=20+8\\ \Rightarrow x=28\\ f,27-x=40\\ \Rightarrow x=27-40\\ \Rightarrow x=-13\)
Câu 4:
a,59.63+59.37=59(63+37)=59.100=5900b,25.23−16:42=25.8−16:16=200−1=199c,346+(−85)+(−346)+15=[346+(−346)]+(−85+15)=0+(−60)=−60a,59.63+59.37=59(63+37)=59.100=5900b,25.23−16:42=25.8−16:16=200−1=199c,346+(−85)+(−346)+15=[346+(−346)]+(−85+15)=0+(−60)=−60d,17.34+17.66−1500=17(34+66)−1500=17.100−1500=1700−1500=200e,(−37).129+37.29=37(−129)+37.29=37(−129+29)=37.(−100)=−3700f,90:[53−(7−5)3]=90:(53−23)=90:(53−8)=90:45=2
Câu 5:
a,(−5)+x=7⇒x=7−(−5)⇒x=12b,x−17=−23⇒x=−23+17⇒x=−6c,4(x−3)=28⇒x−3=28:4⇒x=7+3⇒x=10d,4(x+41)=400⇒x+41=400:4⇒x=100−41⇒x=59a,(−5)+x=7⇒x=7−(−5)⇒x=12b,x−17=−23⇒x=−23+17⇒x=−6c,4(x−3)=28⇒x−3=28:4⇒x=7+3⇒x=10d,4(x+41)=400⇒x+41=400:4⇒x=100−41⇒x=59
e,140:(x−8)=7⇒x−8=140:7⇒x=20+8⇒x=28f,27−x=40⇒x=27−40⇒x=−13
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