b) (-34)-9-26) c) 57-(-43) d) (-25).42+(-25).58 g) 48+79-48-(-21) h)...
Đọc tiếp
b) (-34)-9-26) c) 57-(-43) d) (-25).42+(-25).58 g) 48+79-48-(-21) h) 7+30-(_15)-7
\(b,\left(-34\right)-9-26\\ =\left(-34-26\right)-9\\ =-60-9\\ =-69\\ c,57-\left(-43\right)\\ =57+43\\ =100\\ d,\left(-25\right).42+\left(-25\right).58\\ =\left(-25\right).\left(42+58\right)\\ =-25.100\\ =-2500\\ g,48+79-48-\left(-21\right)\\ =\left(48-48\right)+\left(79+21\right)\\ =0+100\\ =100\\ h,7+30-\left(-15\right)-7\\ =\left(7-7\right)+\left(30+15\right)\\ =0+45=45\)
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