(1)1.3-3.79+9.7-6.21(2)3.64÷4+4.36×0.25(3)49÷(56-12)×(78-12)(4)956×4.25+414×16(5)(19-112)×4×9(6)1+2+3+4+…+49+50.-数学
题文
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答案
(1)1.3-3.79+9.7-6.21, =(1.3+9.7)-(3.79+6.21), =11-10, =1; (2)3.64÷4+4.36×0.25, =3.64×
=(3.64+4.36)×
=8×
=2; (3)
=
=
=
(4)9
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