问题
解答题
计算下列各题(能用运算律用运算律) (1)8+(-
(2)19
(3)-32-|(-5)3|×(-
(4)-3.375×12+4.375×12-36×(
|
答案
(1)8+(-
)-5-(-0.25)=8-1 4
-5+1 4
=3;1 4
(2)19
×(-5)=(19+16 17
)×(-5)=-95-16 17
=-9980 17
;12 17
(3)-32-|(-5)3|×(-
)2-18÷|-(-3)2|-312 5
=-9-125×
-18÷9-314 25
=-9-20-2-31
=-62;
(4)-3.375×12+4.375×12-36×(
-1 18
+1 12
)1 3
=12×(4.375-3.375)-2+3-12
=12-2+3-12
=1.