计算(1)-20+(-14)-(-18)-13(2) 42×(- 2 3 )+(- 3 4 ) ÷(-0.25)(3) -1
计算(1)-20+(-14)-(-18)-13(2)42×(-23)+(-34)÷(-0.25)(3)-123×(0.5-23)÷119(4)(212-16+14)×(-...
计算(1)-20+(-14)-(-18)-13(2) 42×(- 2 3 )+(- 3 4 ) ÷(-0.25)(3) -1 2 3 ×(0.5- 2 3 ) ÷ 1 1 9 (4) (2 1 2 - 1 6 + 1 4 )×(-24) (5)-1 101 -[-3×( 2÷3 ) 2 - 4 3 ÷2 2 ].
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(1)-20+(-14)-(-18)-13 =-20-14+18-13 =-47+18 =-29;
(2) 42×(- )+(- ) ÷(-0.25) =-28+3 =-25;
(3) -1 ×(0.5- ) ÷ 1 =- ×(- )÷ 1 = ÷ 1 = ;
(4) (2 - + )×(-24) =-2 ×24+ ×24- ×24 =-60+4-6 =-62;
(5)-1 101 -[-3×( 2÷3 ) 2 - ÷2 2 ] =-1-[-3× - ÷4] =-1-[- - ] =-1+ = . |
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