(1)23-17-(-7)+(-16) (2)123×80%=x×(1+10%)(1)23-17-(-7)+(-16)(2)123×80%=x×(1+10%)(3)1-(1-0.5)÷3×[2-(-3)的2次方]
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(1)23-17-(-7)+(-16) (2)123×80%=x×(1+10%)(1)23-17-(-7)+(-16)(2)123×80%=x×(1+10%)(3)1-(1-0.5)÷3×[2-(-3)的2次方]
(1)23-17-(-7)+(-16) (2)123×80%=x×(1+10%)
(1)23-17-(-7)+(-16)
(2)123×80%=x×(1+10%)
(3)1-(1-0.5)÷3×[2-(-3)的2次方]
(1)23-17-(-7)+(-16) (2)123×80%=x×(1+10%)(1)23-17-(-7)+(-16)(2)123×80%=x×(1+10%)(3)1-(1-0.5)÷3×[2-(-3)的2次方]
(1)23-17-(-7)+(-16)
=23-17+7-16
=23-10-16
=13-16
=-3
(2)123×80%=x×(1+10%)
123×0.8=1.1x
123×8=11x
11x=984
x=984/11
(3)1-(1-0.5)÷3×[2-(-3)的2次方]
=1-0.5÷3×[2-9]
=1-1/2÷3×(-7)
=1+1/2÷3×7
=1+1/2×1/3×7
=1+7/6
=13/6
《1》-3
《2》984/11≈89.5
《3》13/6
手算的。
(1)
原式=23-17+7-16=-3
(2)
x=(123*0.8)/1.1
=984/11
(3)
原式=1-(0.5*(2-9)/3)
=1+3.5/3
=13/6
-3,
(1)23-17-(-7)+(-16)= - 3
(2)123×80%=x×(1+10%) x=984/11
(3)1-(1-0.5)÷3×[2-(-3)的2次方]=13/6
-3
(1)23-17-(-7)+(-16)
=23-17+7-16
=-3
(2)123×80%=x×(1+10%)
123×80%÷(1+10%)=X
X=984/11
(3)1-(1-0.5)÷3×[2-(-3)的2次方] (那个2次方是-3的吧)
=1-(-6/7)
=1+7/6
=13/6